In many cases, the context that TurboFan's ASTGraphBuilder or subsequent
reduction operations attaches to nodes does not need to be that exact
context, but rather only needs to be one with the same native context,
because it is used internally only to fetch the native context, e.g. for
creating and throwing exceptions.

This reducer recognizes common cases where the context that is specified
for a node can be relaxed to a canonical, less specific one. This
relaxed context can either be the enclosing function's context or a specific
Module or Script context that is explicitly created within the function.

This optimization is especially important for TurboFan-generated code stubs
which use context specialization and inlining to generate optimal code.
Without context relaxation, many extraneous moves are generated to pass
exactly the right context to internal functions like ToNumber and
AllocateHeapNumber, which only need the native context. By turning context
relaxation on, these moves disappear because all these common internal
context uses are unified to the context passed into the stub function, which
is typically already in the correct context register and remains there for
short stubs. It also eliminates the explicit use of a specialized context
constant in the code stub in these cases, which could cause memory leaks.

Review URL: https://codereview.chromium.org/1244583003

Cr-Commit-Position: refs/heads/master@{#29763}

Note that this just narrows the existing workaround for any 'this' in
derived constructors (having a temporal dead zone) so that we can still
recognize static cases correctly (i.e. when 'this' is provably outside
or inside the temporal dead zone).

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/1245653002

Cr-Commit-Position: refs/heads/master@{#29762}

R=jochen@chromium.org,yangguo@chromium.org

Review URL: https://codereview.chromium.org/1231663007

Cr-Commit-Position: refs/heads/master@{#29761}

This will be used to compute the base pointer of the new unified
representation for both on-heap and external typed arrays. The idea is
that either the external or the tagged pointer is 0 (although in
practice, if the tagged pointer is non-0, the external pointer will
contain the offset from the start of the on-heap typed array to the data
in the on-heap typed array).

The HAdd is marked as depending on new-space promotion, as the tagged
pointer might move during GC, and so the result of the addition needs to
be recomputed.

BUG=v8:3996
R=jarin@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1244693002

Cr-Commit-Position: refs/heads/master@{#29760}

R=jochen@chromium.org
BUG=511204
LOG=y

Review URL: https://codereview.chromium.org/1246603002

Cr-Commit-Position: refs/heads/master@{#29759}

Prior to this patch, we enter a global debug mode whenever a break point
is set. By entering this mode, all code is deoptimized and activated
frames are recompiled and redirected to newly compiled debug code.

After this patch, we only deoptimize/redirect for functions we want to
debug. Trigger for this is Debug::EnsureDebugInfo, and having DebugInfo
object attached to the SFI prevents optimization/inlining.

The result is that we can have optimized code for functions without break
points alongside functions that do have break points, which are not
optimized.

R=mstarzinger@chromium.org, ulan@chromium.org
BUG=v8:4132
LOG=Y

Review URL: https://codereview.chromium.org/1233073005

Cr-Commit-Position: refs/heads/master@{#29758}

R=yangguo@chromium.org
BUG=chromium:511988
LOG=n

Review URL: https://codereview.chromium.org/1246643002

Cr-Commit-Position: refs/heads/master@{#29757}

R=mstarzinger@chromium.org
BUG=v8:4312
LOG=N

Review URL: https://codereview.chromium.org/1240273002

Cr-Commit-Position: refs/heads/master@{#29756}

This enables --noflush-optimized-code-cache which allows preserving
entries in the optimized code map accross GCs. This only applies to
values being reachable through other paths.

R=hpayer@chromium.org,hablich@chromium.org

Review URL: https://codereview.chromium.org/1217863006

Cr-Commit-Position: refs/heads/master@{#29755}

This adds the implicit function variable for a function literal to the
declarations list in scope analysis, instead of specially handling it
throughout all back-ends.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/1245603003

Cr-Commit-Position: refs/heads/master@{#29754}

This implements the missing %DefaultConstructorCallSuper runtime
functionality, thereby allowing all compilers to fall-back to that
implementation when the appropriate intrinsic is missing.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/1240993002

Cr-Commit-Position: refs/heads/master@{#29753}

Also, more tests for parameters containing functions or eval or both.

R=adamk@chromium.org, caitpotter88@gmail.com, littledan@chromium.org
BUG=v8:811
LOG=N

Review URL: https://codereview.chromium.org/1225413005

Cr-Commit-Position: refs/heads/master@{#29752}

Revert of Reland concurrent sweeping of code space. (patchset #5 id:80001 of https://codereview.chromium.org/1225733002/)

Reason for revert:
Tests became flaky.

Original issue's description:
> Reland concurrent sweeping of code space.
>
> BUG=chromium:506778,chromium:506957,chromium:507211
> LOG=n
>
> Committed: https://crrev.com/806b81f11e3bfaef0d4330c7669e6934074be9cb
> Cr-Commit-Position: refs/heads/master@{#29748}

TBR=jochen@chromium.org,mvstanton@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:506778,chromium:506957,chromium:507211

Review URL: https://codereview.chromium.org/1242743002

Cr-Commit-Position: refs/heads/master@{#29751}

The choice for the symbol seems to be locale-dependent.

R=jochen@chromium.org
BUG=v8:4314
LOG=N

Review URL: https://codereview.chromium.org/1238133003

Cr-Commit-Position: refs/heads/master@{#29750}

We should not install the SIMD object on the global object unless
support for SIMD is actually turned on by the flag. Otherwise calling
SIMD.Float32x4() will hit unreachable code. We accidentally SIMD.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/1240223002

Cr-Commit-Position: refs/heads/master@{#29749}

BUG=chromium:506778,chromium:506957,chromium:507211
LOG=n

Review URL: https://codereview.chromium.org/1225733002

Cr-Commit-Position: refs/heads/master@{#29748}

BUG=chromium:505007
LOG=N

Review URL: https://codereview.chromium.org/1238273003

Cr-Commit-Position: refs/heads/master@{#29747}

This removes a dependency on the size of the pool. Whilst the size is
checked in debug mode, it is still more robust to use a label.

This should also be cherry-picked to fix 4.4.63.20. (At that time, the
size of the pool was _not_ checked, and was sometimes wrong.)

This partially reverts 879550ce, "[arm] Don't call branch_offset within
CheckConstPool." However, branch_offset now only blocks the constant
pool if it is not already blocked.

BUG=

Review URL: https://codereview.chromium.org/1227403006

Cr-Commit-Position: refs/heads/master@{#29746}

BUG=chromium:510426
LOG=n

Review URL: https://codereview.chromium.org/1246513002

Cr-Commit-Position: refs/heads/master@{#29745}

In optimized code, it's not guaranteed that the current context
is stored in its frame slot.

R=bmeurer@chromium.org
BUG=v8:4309
LOG=N

Committed: https://crrev.com/3a0ee39cbde6a9778cfc4e2a6a0a8ff68933ff38
Cr-Commit-Position: refs/heads/master@{#29697}

Review URL: https://codereview.chromium.org/1239033002

Cr-Commit-Position: refs/heads/master@{#29744}

BUG=chromium:510738
LOG=N

Review URL: https://codereview.chromium.org/1228113008

Cr-Commit-Position: refs/heads/master@{#29743}

Original issue's description:
> BUG=v8:4134
> LOG=n
> R=yangguo@chromium.org
>
> Review URL: https://codereview.chromium.org/1239053004

BUG=v8:4134
LOG=n
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1235603004

Cr-Commit-Position: refs/heads/master@{#29742}

Make sure it stays that way

BUG=v8:4134
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1242563003

Cr-Commit-Position: refs/heads/master@{#29741}

BUG=v8:4134
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1244433003

Cr-Commit-Position: refs/heads/master@{#29740}

Rolling v8/testing/gtest to 00a70a9667d92a4695d84e4fa36b64f611f147da

Rolling v8/tools/clang to 6ea730d39bf31911ccef92397dbc8d71136d3899

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1228063006

Cr-Commit-Position: refs/heads/master@{#29739}

Rolling v8/third_party/icu to 508e9274baaa5caa8de9cf4c26a24e926a15ccf0

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1236133007

Cr-Commit-Position: refs/heads/master@{#29738}

Prevents fatal error in debug builds

BUG=v8:4271, 506954
R=binji@chromium.org
LOG=N

Committed: https://crrev.com/43ce9c6f101c4224addd9a54e0c39963188dc7fa
Cr-Commit-Position: refs/heads/master@{#29524}

Review URL: https://codereview.chromium.org/1214053004

Cr-Commit-Position: refs/heads/master@{#29737}

BUG=chromium:497295
R=jarin@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1208933006

Cr-Commit-Position: refs/heads/master@{#29736}

TEST=mjsunit/asm/embenchen/zlib
BUG=

Review URL: https://codereview.chromium.org/1232313007

Cr-Commit-Position: refs/heads/master@{#29735}

NumberFormat previously just used a min of 0 digits after the decimal and a max of 3. This CL changes it so that we use the ICU currency data, and set the min and max to the number of numbers after the decimal point for each currency.

This CL also fixes a small bug where if the minimum fraction digits is above 3 but the maximum fraction digits isn't set, then it returns with only three numbers after the decimal point.

BUG=435465,473104,304722
LOG=Y

Review URL: https://codereview.chromium.org/1231613006

Cr-Commit-Position: refs/heads/master@{#29734}

BUG=chromium:509936
LOG=y

Review URL: https://codereview.chromium.org/1241953010

Cr-Commit-Position: refs/heads/master@{#29733}

Port 3285e3bf

Original commit message
    Additionally, push the allocation site or undefined independently
    of creating a memento to preserve a fixed size for the construct
    frames.

R=mlippautz@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1229163005

Cr-Commit-Position: refs/heads/master@{#29732}

An innocent-looking change in 'c63e50ed Reland Update V8 DEPS.' exposed
latent bugs in SubStringStub and StringCharFromCodeGenerator.

TEST=mjsunit/string-replace, msjunit/string-split, others....
BUG=

Review URL: https://codereview.chromium.org/1233903003

Cr-Commit-Position: refs/heads/master@{#29731}

Revert of Make d8 stop using to-be-deprecated APIs (patchset #3 id:40001 of https://codereview.chromium.org/1239053004/)

Reason for revert:
[Sheriff] Breaks:
http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20debug%20-%20code%20serializer/builds/3400

Original issue's description:
> Make d8 stop using to-be-deprecated APIs
>
> BUG=v8:4134
> LOG=n
> R=yangguo@chromium.org
>
> Committed: https://crrev.com/af82ef84b4f851411f00e69167ab29382c7499b8
> Cr-Commit-Position: refs/heads/master@{#29726}

TBR=yangguo@chromium.org,jochen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4134

Review URL: https://codereview.chromium.org/1240993003

Cr-Commit-Position: refs/heads/master@{#29730}

Revert of Reland "Enable loads and stores to global vars through property cell shortcuts installed into paren… (patchset #1 id:1 of https://codereview.chromium.org/1237043006/)

Reason for revert:
chromium:510738, chromium:510911

Original issue's description:
> Reland "Enable loads and stores to global vars through property cell shortcuts installed into parent script context."
>
> Committed: https://crrev.com/48584df5ed97e2cdec1b4900f783c47adc3a3d32
> Cr-Commit-Position: refs/heads/master@{#29670}

TBR=verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1238163002

Cr-Commit-Position: refs/heads/master@{#29729}

BUG=chromium:509936
LOG=y

Review URL: https://codereview.chromium.org/1228113007

Cr-Commit-Position: refs/heads/master@{#29728}

BUG=chromium:509936
LOG=y

Review URL: https://codereview.chromium.org/1241973003

Cr-Commit-Position: refs/heads/master@{#29727}

BUG=v8:4134
LOG=n
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1239053004

Cr-Commit-Position: refs/heads/master@{#29726}

BUG=chromium:509936
LOG=y

Review URL: https://codereview.chromium.org/1242123002

Cr-Commit-Position: refs/heads/master@{#29725}

Don't chicken out on upload already, and ignore 'none' value

BUG=none
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1237353003

Cr-Commit-Position: refs/heads/master@{#29724}