* Ensure that a source position is already specified in generated code before
  prologue is assembled.
* Ensure source position is set for instructions before their gaps are assembled
  (this fixes missing source position information at the beginning of deferred
  code).
* Don't output source position information for gap moves that are
  redundant. This led to extraneous, confusing source positions for constants
  that did not end up producing any code.
* Output source position information that is usable in turbolizer when --trace-turbo
  is specified.

LOG=N

Review-Url: https://codereview.chromium.org/2599433002
Cr-Commit-Position: refs/heads/master@{#41914}

Also support inlining the builtins String.prototype.charCodeAt and
String.prototype.charAt if the index type is not statically known
to be in the Unsigned32 range, but in anything in Integral32 plus
minus zero and NaN.

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2597913002
Cr-Commit-Position: refs/heads/master@{#41913}

Introduce a dedicated StringCharCodeAt builtin, that performs the core
logic of String.prototype.charCodeAt and lower the StringCharCodeAt
simplified operator to a call to this builtin rather than inlining the
full functionality into each and every TurboFan graph using it. This can
significantly reduce compile time in some cases (i.e. can easily shave
off over 50% of compile time overhead for small functions that call
String.prototype.charCodeAt).

Currently it returns the char code as TaggedSigned value, but
middle-term we should make it possible to return untagged values
from builtins.

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2600443002
Cr-Commit-Position: refs/heads/master@{#41912}

R=jgruber@chromium.org
BUG=v8:5530

Review-Url: https://codereview.chromium.org/2589203002
Cr-Commit-Position: refs/heads/master@{#41911}

R=bmeurer@chromium.org
BUG=v8:5767

Review-Url: https://codereview.chromium.org/2599693002
Cr-Commit-Position: refs/heads/master@{#41910}

Previously String element access and String.prototype.charAt were
lowered to a subgraph StringFromCharCode(StringCharCodeAt(s, k)),
however that can be fairly expensive both runtime and compile time
wise. The dedicated StringCharAt operator is implemented via a call
to a builtin that does exactly this.

R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2599683002
Cr-Commit-Position: refs/heads/master@{#41909}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/564d650..5c10e06

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/f3dc14e..489a5bc

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/780832e..f6f94f4

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review-Url: https://codereview.chromium.org/2597893002
Cr-Commit-Position: refs/heads/master@{#41908}

This CL includes several small bug fixes for trap handlers. Among the changes:

* Use the correct representation for ProtectedLoads, enabling protected loads of
  floating point types.

* Including the protected instruction list in what gets serialized for Code
  objects. This is needed to allow deserialization for Wasm modules to work.

* Get the context needed to through and exception from the Isolate rather than
  getting it as a parameter to the Protected instructions. Passing it in as an
  argument is problematic when code is compiled ahead of time, as the context
  may not be known yet. The new approach is similar to how it works for TrapIf
  and TrapUnless.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5277

Review-Url: https://codereview.chromium.org/2591903002
Cr-Commit-Position: refs/heads/master@{#41907}

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com

BUG=

Review-Url: https://codereview.chromium.org/2591643005
Cr-Commit-Position: refs/heads/master@{#41906}

R=adamk@chromium.org

Review-Url: https://codereview.chromium.org/2593243002
Cr-Commit-Position: refs/heads/master@{#41905}

TBR=ishell@chromium.org

Review-Url: https://codereview.chromium.org/2599523002
Cr-Commit-Position: refs/heads/master@{#41904}

Review-Url: https://codereview.chromium.org/2597693002
Cr-Commit-Position: refs/heads/master@{#41903}

This patch also refactors most of PromiseThen into InternalPromiseThen to
be reused with PromiseCatch and also changes InternalResolvePromise to
return and not branch.

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2596553002
Cr-Commit-Position: refs/heads/master@{#41902}

R=bmeurer@chromium.org, gsathya@chromium.org, yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2591613003 .
Cr-Commit-Position: refs/heads/master@{#41901}

Change bytecode-expectations-printer.cc in the cctest application so
that intrinsic function names are printed rather than their native
context index.

This minimizes the amount of unnecessary changes to the bytecode
expectations that need to happen whenever the context fields are
changed.

BUG=v8:5769
R=neis@chromium.org, rmcilroy@chromium.org, adamk@chromium.org

Review-Url: https://codereview.chromium.org/2593823002
Cr-Commit-Position: refs/heads/master@{#41900}

This is a preliminary step for constant tracking.

BUG=v8:5495

Review-Url: https://codereview.chromium.org/2595893002
Cr-Commit-Position: refs/heads/master@{#41899}

Port 93df0940

Original Commit Message:

    Literal arrays and feedback vectors for a function can be garbage
    collected if we don't have a rooted closure for the function, which
    happens often. It's expensive to come back from this (recreating
    boilerplates and gathering feedback again), and the cost is
    disproportionate if the function was inlined into optimized code.

    To guard against losing these arrays when we need them, we'll now
    create literal arrays when creating the feedback vector for the outer
    closure, and root them strongly in that vector.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:5456
LOG=N

Review-Url: https://codereview.chromium.org/2592043003
Cr-Commit-Position: refs/heads/master@{#41898}

Review-Url: https://codereview.chromium.org/2593033002
Cr-Commit-Position: refs/heads/master@{#41897}

Revert of abstract_code: return compiled code for compiled shared funcs (patchset #2 id:20001 of https://codereview.chromium.org/2592703002/ )

Reason for revert:
Breaks tree:

http://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/builds/9970

Original issue's description:
> abstract_code: return compiled code for compiled shared funcs
>
> SharedFunctionInfo's abstract_code was returning the bytecode array
> whenever SharedFunctionInfo had a bytecode array, even if the function
> was compiled (e.g. tiered up to FCG). This meant that abstract_code
> could return code that is not actually the code that will run, which was
> causing problems in profiling as the sampled PC did not match the known
> code offset.
>
> This patch changes both SharedFunctionInfo and JSFunction to return the
> bytecode if-and-only-if they are not compiled and have a bytecode array
> to return, or they already point to the interpreter trampoline.
>
> BUG=v8:5758
>
> Review-Url: https://codereview.chromium.org/2592703002
> Cr-Commit-Position: refs/heads/master@{#41894}
> Committed: https://chromium.googlesource.com/v8/v8/+/679b31c21425ecdd86c40a8a02ac131b72f7bc6b

TBR=bmeurer@chromium.org,mstarzinger@chromium.org,mvstanton@chromium.org,mythria@chromium.org,rmcilroy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5758

Review-Url: https://codereview.chromium.org/2591223002
Cr-Commit-Position: refs/heads/master@{#41896}

On ARM Neon at least, denormals flush to zero, which may not match
regular FP behavior.

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2598583002
Cr-Commit-Position: refs/heads/master@{#41895}

SharedFunctionInfo's abstract_code was returning the bytecode array
whenever SharedFunctionInfo had a bytecode array, even if the function
was compiled (e.g. tiered up to FCG). This meant that abstract_code
could return code that is not actually the code that will run, which was
causing problems in profiling as the sampled PC did not match the known
code offset.

This patch changes both SharedFunctionInfo and JSFunction to return the
bytecode if-and-only-if they are not compiled and have a bytecode array
to return, or they already point to the interpreter trampoline.

BUG=v8:5758

Review-Url: https://codereview.chromium.org/2592703002
Cr-Commit-Position: refs/heads/master@{#41894}

Literal arrays and feedback vectors for a function can be garbage
collected if we don't have a rooted closure for the function, which
happens often. It's expensive to come back from this (recreating
boilerplates and gathering feedback again), and the cost is
disproportionate if the function was inlined into optimized code.

To guard against losing these arrays when we need them, we'll now
create literal arrays when creating the feedback vector for the outer
closure, and root them strongly in that vector.

BUG=v8:5456

Review-Url: https://codereview.chromium.org/2504153002
Cr-Commit-Position: refs/heads/master@{#41893}

The two remaining uses of this intrinsic in debug.js and mirrors.js now
simply rely on the runtime function.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2591923003
Cr-Commit-Position: refs/heads/master@{#41892}

This is more renaming work to comply with the naming in the public
design repository. E.g. types are called "value types" and we no longer
refer to ASTs.

R=clemensh@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2594993002
Cr-Commit-Position: refs/heads/master@{#41891}

No need to untag/tag flags, and we can also omit the write barrier.

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2591193002
Cr-Commit-Position: refs/heads/master@{#41890}

Since WASM is no longer an AST :-(

R=clemensh@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2594973003
Cr-Commit-Position: refs/heads/master@{#41889}

Also, provide a variadic template Return function for easier use, and
refactor the underlying Return function to not use the Buffer, since
that might still be needed later (for example if trap code is generated
during CallIndirect, and the arguments to the call are stored in the
buffer).

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2591903003
Cr-Commit-Position: refs/heads/master@{#41888}

The methods Intl.NumberFormat.prototype.v8Parse and
Intl.DateTimeFormat.prototype.v8Parse were removed several months
ago due to low usage and lack of standardization potential. This
patch removes some runtime functions used to implement them, which
were accidentally left in when they were taken out.

BUG=v8:3785

Review-Url: https://codereview.chromium.org/2591103003
Cr-Commit-Position: refs/heads/master@{#41887}

R=jarin@chromium.org
BUG=675648

Review-Url: https://codereview.chromium.org/2598463003
Cr-Commit-Position: refs/heads/master@{#41886}

R=clemensh@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2590243003
Cr-Commit-Position: refs/heads/master@{#41885}

BUG=chromium:664286

Review-Url: https://codereview.chromium.org/2595673002
Cr-Commit-Position: refs/heads/master@{#41884}

Update string-capitalize expected result because now it
passes all the tests in the file.
Mark fast/js/string-capitalization as failing with no_i18n.

Relanding after revert because the failure was taken care of
by Adam's CL at https://codereview.chromium.org/2597543002 .

BUG=v8:4477, v8:4476
TEST=test262/{built-ins,intl402}/Strings/*, webkit/fast/js/*,
     mjsunit/string-case, intl/general/case*

Cr-Original-Commit-Position: refs/heads/master@{#41834}
Committed: https://chromium.googlesource.com/v8/v8/+/7c79e23c34ea971947eedc6e42d8a882617c0e47
Review-Url: https://codereview.chromium.org/2588963002
Cr-Commit-Position: refs/heads/master@{#41883}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/53a8a4b..564d650

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/70f42a7..f3dc14e

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/fcefe9f..780832e

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review-Url: https://codereview.chromium.org/2593913002
Cr-Commit-Position: refs/heads/master@{#41882}

R=joransiu@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2593803003
Cr-Commit-Position: refs/heads/master@{#41881}

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2591033002
Cr-Commit-Position: refs/heads/master@{#41880}

This removes RegExpPrototypeSpeciesGetter and IteratorPrototypeIterator and
uses ReturnReceiver builtin instead.

This patch also ports the PromiseSpecies to TF by reusing this
builtin.

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2590373002
Cr-Commit-Position: refs/heads/master@{#41879}

The test depends on tricky stack space requirements, so it stopped
working in some configurations win FLAG_min_preparse_length was removed
in commit 4a5b7e32.

As a workaround, pass --no-lazy until the test can be refined to work
on all configurations.

BUG=v8:5729
TBR=marja@chromium.org

Review-Url: https://codereview.chromium.org/2596673002
Cr-Commit-Position: refs/heads/master@{#41878}

BUG=v8:4954
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2591853002
Cr-Original-Commit-Position: refs/heads/master@{#41873}
Committed: https://chromium.googlesource.com/v8/v8/+/07277202cf136e70c147e2f000e48964332bb01c
Review-Url: https://codereview.chromium.org/2591853002
Cr-Commit-Position: refs/heads/master@{#41877}

This test requires its objects to live in new space, so running it
through gc stress runs just makes it susceptible to flakiness, as
was recently seen when turning on the --harmony-string-padding
flag (which just adds an extra JS file to the bootstrapper sequence).

TBR=ishell@chromium.org, jkummerow@chromium.org

Review-Url: https://codereview.chromium.org/2597543002 .
Cr-Commit-Position: refs/heads/master@{#41876}

git cl format flagged this while merging

Review-Url: https://codereview.chromium.org/2594693003
Cr-Commit-Position: refs/heads/master@{#41875}