Previous to this patch, both the lithium and TurboFan register
allocators tracked allocated registers by "indices", rather than
the register codes used elsewhere in the runtime. This patch
ensures that codes are used everywhere, and in the process cleans
up a bunch of redundant code and adds more structure to how the
set of allocatable registers is defined.

Some highlights of changes:

* TurboFan's RegisterConfiguration class moved to V8's top level
  so that it can be shared with Crankshaft.
* Various "ToAllocationIndex" and related methods removed.
* Code that can be easily shared between Register classes on
  different platforms is now shared.
* The list of allocatable registers on each platform is declared
  as a list rather than implicitly via the register index <->
  code mapping.

Committed: https://crrev.com/80bc6f6e11f79524e3f1ad05579583adfd5f18b2
Cr-Commit-Position: refs/heads/master@{#30913}

Review URL: https://codereview.chromium.org/1287383003

Cr-Commit-Position: refs/heads/master@{#31075}

BUG=v8:4217
LOG=Y

Review URL: https://codereview.chromium.org/1381543005

Cr-Commit-Position: refs/heads/master@{#31074}

BUG=chromium:535160,v8:4459
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1384683002

Cr-Commit-Position: refs/heads/master@{#31073}

This restores size_of_objects and removed unused fields.

BUG=chromium:538539
LOG=NO

Review URL: https://codereview.chromium.org/1380953003

Cr-Commit-Position: refs/heads/master@{#31072}

R=ulan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1384453005

Cr-Commit-Position: refs/heads/master@{#31071}

See bug description.

R=hpayer@chromium.org
BUG=chromium:538257
LOG=N

Review URL: https://codereview.chromium.org/1381633005

Cr-Commit-Position: refs/heads/master@{#31070}

The problem was harmless, but made --enable-slow-asserts unhappy.

BUG=chromium:538086
LOG=n
R=cbruni@chromium.org

Review URL: https://codereview.chromium.org/1384673003

Cr-Commit-Position: refs/heads/master@{#31069}

This lowers JSCreateFunctionContext nodes to call the above stub for
help with allocating function contexts when possible. It also contains
an implementation for inlined allocations of such contexts, which is
still behind a flag until inlined allocations are ready for prime time.

TEST=unittests/JSTypedLoweringTest.JSCreateFunctionContext
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1380113002

Cr-Commit-Position: refs/heads/master@{#31068}

BUG=v8:4458
LOG=N
NOTRY=true

Review URL: https://codereview.chromium.org/1387533002

Cr-Commit-Position: refs/heads/master@{#31067}

Revert of [Interpreter] Add CallRuntime support to the interpreter. (patchset #6 id:180001 of https://codereview.chromium.org/1362383002/ )

Reason for revert:
Broke Arm64 bot (CEntry stub is trying to pop arguments off stack when argv_in_reg, so I need to fix this).

Original issue's description:
> [Interpreter] Add CallRuntime support to the interpreter.
>
> Adds support for calling runtime functions from the interpreter. Adds the
> CallRuntime bytecode which takes a Runtime::FunctionId of the function to call
> and the arguments in sequential registers. Adds a InterpreterCEntry builtin
> to enable the interpreter to enter C++ code based on the functionId.
>
> Also renames Builtin::PushArgsAndCall to Builtin::InterpreterPushArgsAndCall
> and groups all the interpreter builtins together.
>
> BUG=v8:4280
> LOG=N
>
> Committed: https://crrev.com/40e8424b744f8b6e3e1d93e20f23487419911dfc
> Cr-Commit-Position: refs/heads/master@{#31064}

TBR=bmeurer@chromium.org,oth@chromium.org,mstarzinger@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4280

Review URL: https://codereview.chromium.org/1387543002

Cr-Commit-Position: refs/heads/master@{#31066}

BUG=

Review URL: https://codereview.chromium.org/1384453003

Cr-Commit-Position: refs/heads/master@{#31065}

Adds support for calling runtime functions from the interpreter. Adds the
CallRuntime bytecode which takes a Runtime::FunctionId of the function to call
and the arguments in sequential registers. Adds a InterpreterCEntry builtin
to enable the interpreter to enter C++ code based on the functionId.

Also renames Builtin::PushArgsAndCall to Builtin::InterpreterPushArgsAndCall
and groups all the interpreter builtins together.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1362383002

Cr-Commit-Position: refs/heads/master@{#31064}

BUG=

Review URL: https://codereview.chromium.org/1370353003

Cr-Commit-Position: refs/heads/master@{#31063}

Rolling v8/third_party/icu to 94e4b770ce2f6065d4261d29c32683a6099b9d93

Rolling v8/tools/swarming_client to e4c0e242eeec361886ed2b89591a505ebe24db43

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

Review URL: https://codereview.chromium.org/1383963002

Cr-Commit-Position: refs/heads/master@{#31062}

Swarming won't support an incremental data file. By just
sorting the lowest hanging fruits to the beginning we
already get a big bang for the buck (>80% of the improvement
we get otherwise).

This will require semi-regular manual updates of the
slowest tests.

BUG=chromium:535160
LOG=n

Review URL: https://codereview.chromium.org/1385443002

Cr-Commit-Position: refs/heads/master@{#31061}

Review URL: https://codereview.chromium.org/1378253002

Cr-Commit-Position: refs/heads/master@{#31060}

Disable vector store ICs for mjsunit/call-counts because slot indices change when --vector-stores is enabled.

Review URL: https://codereview.chromium.org/1381073003

Cr-Commit-Position: refs/heads/master@{#31059}

Adds support for short operands, starting with kIdx16. Introduces
BytecodeTraits to enable compile time determination of various traits for a
bytecode, such as size, operands, etc. Reworks BytecodeIterator,
BytecodeArrayBuilder and Bytecodes::Decode to support 16 bit operands. Adds
support to Interpreter to load 16 bit operands.

Also fixes a bug with ToBoolean where it wouldn't get emitted at the start
of a block, and added a test.

BytecodeTraits template magic inspired by oth@chromium.org.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1370893002

Cr-Commit-Position: refs/heads/master@{#31058}

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1377423002

Cr-Commit-Position: refs/heads/master@{#31057}

It was supposed to be used by the CPU profiler. But as long as
these ranges are not built when profiler is not running, once
the profiler is started there're no ranges for already compiled
functions. So basically this code never worked.

As long as now CPU profiler uses another approach this code is no
longer needed.

Review URL: https://codereview.chromium.org/1376333003

Cr-Commit-Position: refs/heads/master@{#31056}

R=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1378343002

Cr-Commit-Position: refs/heads/master@{#31055}

Introduce %_ToNumber intrinsic, which just calls to the existing
ToNumberStub, and remove all uses of our custom JavaScript plus
intrinsics based ToNumber and friends.

Also replace the TO_NUMBER_INLINE macro with TO_NUMBER,
which is currently a wrapper for %_ToNumber. Newly written JS
code should use TO_NUMBER (similar to TO_STRING, TO_INT32,
and friends).

Also finally remove the DefaultString/DefaultNumber builtins, which
are basically the ES5 version of ToPrimitive. Now all code uses the
ES6 version, which is implemented in Object::ToPrimitive and
JSReceiver::ToPrimitive in C++.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_layout_dbg,v8_linux_nosnap_dbg
R=jarin@chromium.org
BUG=v8:4307
LOG=n

Review URL: https://codereview.chromium.org/1384443002

Cr-Commit-Position: refs/heads/master@{#31054}

This feature is no longer needed because of the autotag bot.

NOTRY=true
LOG=N
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1384523002

Cr-Commit-Position: refs/heads/master@{#31053}

Improve bytecode generation for if when there's no else clause.

Display target addresses for jump instructions in
Bytecode::Disassemble().

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1373903005

Cr-Commit-Position: refs/heads/master@{#31052}

R=rossberg
BUG=v8:2529
LOG=Y

Review URL: https://codereview.chromium.org/1375203004

Cr-Commit-Position: refs/heads/master@{#31051}

This CL also allows to use arbitrary number of feedback vector elements for particular slot kind.

Review URL: https://codereview.chromium.org/1370303004

Cr-Commit-Position: refs/heads/master@{#31050}

Avoid hard-coding expected parameter indices.  These depend on the
frame size which can vary (e.g. if embedded constant pools are
enabled).

R=oth@chromium.org, rmcilroy@chromium.org, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1375373002

Cr-Commit-Position: refs/heads/master@{#31049}

BUG=

Review URL: https://codereview.chromium.org/1377723003

Cr-Commit-Position: refs/heads/master@{#31048}

NOTRY=true
LOG=N
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1369213003

Cr-Commit-Position: refs/heads/master@{#31047}

This is a simplified version of chromium's isolate driver:
- 'prepare' will create a *.isolate.gen.json with the
arguments to be used later.
- other modes will just be passed through to the isolate
script.

BUG=chromium:535160
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1378133005

Cr-Commit-Position: refs/heads/master@{#31046}

Port https://codereview.chromium.org/1154633003/

BUG=chromium:535160
LOG=n

Review URL: https://codereview.chromium.org/1380983002

Cr-Commit-Position: refs/heads/master@{#31045}

We need to do other things with this bindings object, like store a feedback vector. Therefore, it's a good time to wrap it up in a helper class.

BUG=

Review URL: https://codereview.chromium.org/1369293003

Cr-Commit-Position: refs/heads/master@{#31044}

With this change mergeinfo.py gets more useful. There is
a distinction between merges and follow-up CLs/ports/reverts.

Also the information is show if the commit is already
rolled/an lkgr/deployed to Canary channel.

Additionally some formatting errors were resolved and
the already existing git wrapper used.

LOG=N
R=machenbach@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1341303002

Cr-Commit-Position: refs/heads/master@{#31043}

Var-bindings may shadow parameters from a non-simple parameter list. When that happens: they create separate bindings, but are initialised with the respective parameter value. Thus:

(function(x, f = () => x) { var x; var y = x; x = 2; return [x, y, f()] })(1) -->  [2, 1, 1]

This CL implements that by inserting a suitable assignment for every shadwowing var-variable (e.g., x = outer_x above) at the beginning of the function's body block.

R=adamk@chromium.org
BUG=v8:4440,v8:811
LOG=N

Review URL: https://codereview.chromium.org/1371333004

Cr-Commit-Position: refs/heads/master@{#31042}

This is in preparation of implementing ES6 completion semantics and
depends on #1362333002.

R=rossberg
BUG=

Review URL: https://codereview.chromium.org/1362363002

Cr-Commit-Position: refs/heads/master@{#31041}

- Wasted bytes are now accounted where they accrue, i.e., the corresponding free
  list. The amount of waste is transferred by concatenating free lists.
- During concatenation, free lists are no longer locked on FreeListCategory
  level, but in the FreeList itself, simplifying the sync between contained nodes
  and wasted bytes (which are effectively dropped nodes).

This is pre-work for properly moving memory to compaction spaces, which requires
correct accounting of wasted memory.

BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1379833002

Cr-Commit-Position: refs/heads/master@{#31040}

R=ishell@chromium.org
BUG=chromium:536790
LOG=N

Review URL: https://codereview.chromium.org/1375913002

Cr-Commit-Position: refs/heads/master@{#31039}

Rolling v8/buildtools to 0c88009d5c50b9f21b6f8849db08abfb9eb29f1e

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

Review URL: https://codereview.chromium.org/1381873002

Cr-Commit-Position: refs/heads/master@{#31038}

The ES2015 spec is missing an extension of sloppy-mode block-scoped function
behavior to the global scope in scripts, as well as to eval. This patch
brings that hoisting to those two areas. The behavior is not perfectly
spec-compliant since properties created on the global scope should be
set as enumerable even if they are non-enumerable previously, but the
attributes will not be modified if the property already exists under
this patch.

BUG=v8:4441
LOG=Y
R=adamk
TEST=reddit comment functionality seems to be fixed

Review URL: https://codereview.chromium.org/1376623002

Cr-Commit-Position: refs/heads/master@{#31037}

Port c90c60ba

Original commit message:
    Make sure to always reference it indirectly. This allows us to make the vector
    native-context dependent should we wish.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1381803002

Cr-Commit-Position: refs/heads/master@{#31036}