This relands macroassembler instructions and weak cell caching and
does not include parts that caused "Linux ASan LSan" test failures.

BUG=v8:3663
LOG=N

Review URL: https://codereview.chromium.org/764003003

Cr-Commit-Position: refs/heads/master@{#25615}

BUG=chromium:374740
LOG=n
TEST=python -m unittest run_perf_test
NOTRY=true

Review URL: https://codereview.chromium.org/768143002

Cr-Commit-Position: refs/heads/master@{#25614}

Beautiful code... :-}

BUG=chromium:437765
LOG=y

Review URL: https://codereview.chromium.org/775613002

Cr-Commit-Position: refs/heads/master@{#25613}

Most of the run time came from testing with all possible flag combinations. None
of the flags passed affect the test, and there are specialized tests for testing
the features behind the flags; no need to slow down the generic test.

With these changes, run time for debug build goes from 186 s to 0.5 s.

In addition, fixed some missing commas between the test cases.

R=svenpanne@chromium.org
BUG=v8:3707
LOG=N

Review URL: https://codereview.chromium.org/766673003

Cr-Commit-Position: refs/heads/master@{#25612}

R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/760403003

Cr-Commit-Position: refs/heads/master@{#25611}

TEST=unittests
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/771153002

Cr-Commit-Position: refs/heads/master@{#25610}

TEST=unittests
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/769193003

Cr-Commit-Position: refs/heads/master@{#25609}

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/767453004

Cr-Commit-Position: refs/heads/master@{#25608}

BUG=

Review URL: https://codereview.chromium.org/767233003

Cr-Commit-Position: refs/heads/master@{#25607}

Groups and implicit references are no longer relevant at this point.

Also add tests that fail if the first or second round of ephemeral
marking is omitted

BUG=none
R=mstarzinger@chromium.org,hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/761343004

Cr-Commit-Position: refs/heads/master@{#25606}

TEST=unittests
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/772723003

Cr-Commit-Position: refs/heads/master@{#25605}

R=danno@chromium.org,bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/770203003

Cr-Commit-Position: refs/heads/master@{#25604}

Allows \u{xxxxx} in variable names and string literals (not yet in regexps).

Everything's behind the --harmony-unicode flag.

BUG=

Review URL: https://codereview.chromium.org/716423002

Cr-Commit-Position: refs/heads/master@{#25603}

R=jarin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/771683002

Cr-Commit-Position: refs/heads/master@{#25602}

The mystery crash never reappeared once the debugging code was in place.

R=jochen@chromium.org
BUG=

Review URL: https://codereview.chromium.org/760863003

Cr-Commit-Position: refs/heads/master@{#25601}

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/771713002

Cr-Commit-Position: refs/heads/master@{#25600}

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/771123002

Cr-Commit-Position: refs/heads/master@{#25599}

v8::Object already has GetIdentityHash on it. This change adds its counterpart to v8::Name.

BUG=chromium:437416
LOG=Y

Review URL: https://codereview.chromium.org/753373003

Cr-Commit-Position: refs/heads/master@{#25598}

Revert of Use weak cells in map checks in polymorphic ICs. (patchset #8 id:140001 of https://codereview.chromium.org/753993003/)

Reason for revert:
[Sheriff] Speculative revert for breaking chromium asan (roll blocker):
http://build.chromium.org/p/client.v8/builders/Linux%20ASan%20LSan%20Tests%20%281%29/builds/1683

Original issue's description:
> Use weak cells in map checks in polymorphic ICs.
>
> BUG=v8:3663
> LOG=N

TBR=mvstanton@chromium.org,akos.palfi@imgtec.com,weiliang.lin@intel.com,ulan@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=v8:3663

Review URL: https://codereview.chromium.org/771033003

Cr-Commit-Position: refs/heads/master@{#25597}

Revert of MIPS: Use weak cells in map checks in polymorphic ICs. (patchset #1 id:1 of https://codereview.chromium.org/767623003/)

Reason for revert:
Need to revert the ported CL:
https://codereview.chromium.org/771033003/

Original issue's description:
> MIPS: Use weak cells in map checks in polymorphic ICs.
>
> Port 45a36948
>
> Fix typo in the mips ports.
>
> BUG=

TBR=ulan@chromium.org,danno@chromium.org,akos.palfi@imgtec.com,balazs.kilvady@imgtec.com,gergely.kis@imgtec.com,dusan.milosavljevic@imgtec.com,paul.lind@imgtec.com
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/768303002

Cr-Commit-Position: refs/heads/master@{#25596}

port 50c4d882

BUG=

Review URL: https://codereview.chromium.org/770183002

Cr-Commit-Position: refs/heads/master@{#25595}

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/770193002

Cr-Commit-Position: refs/heads/master@{#25594}

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/770163002

Cr-Commit-Position: refs/heads/master@{#25593}

Also, remove V8_CC_CLANG since it's not read anywhere (and ideally shouldn't
be).

Clang tries to be compatible with gcc in clang mode, and with msvc in clang-cl
mode. It wants to go down the same code paths that these compilers want to go
down in most cases.

For example, V8PRIxPTR was set incorrectly on Windows 64-bit before this change
since macros.h assumed that checking for V8_CC_MSVC is enough to find LLP64
systems, but V8_CC_MSVC wasn't set for clang.  Most other existing checks for
V8_CC_MSVC should be taken for clang-cl too (and for the remaining ones,
clang-cl is happy with either code path).

Likewise, V8_IMMEDIATE_CRASH is currently set to a suboptimal value with clang
since __builtin_trap() is only used if V8_CC_GNU is set.

Including clang in the gcc and cl macros is also what chromium does.

BUG=chromium:82385
LOG=y

Review URL: https://codereview.chromium.org/757553004

Cr-Commit-Position: refs/heads/master@{#25592}

TEST=mjsunit,cctest,unittests
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/763963002

Cr-Commit-Position: refs/heads/master@{#25591}

Port 45a36948

Fix typo in the mips ports.

BUG=

Review URL: https://codereview.chromium.org/767623003

Cr-Commit-Position: refs/heads/master@{#25590}

R=arv@chromium.org
BUG=v8:3330
LOG=N

Review URL: https://codereview.chromium.org/770843002

Cr-Commit-Position: refs/heads/master@{#25589}

BUG=

Review URL: https://codereview.chromium.org/770453003

Cr-Commit-Position: refs/heads/master@{#25588}

R=dcarney@chromium.org
BUG=

Review URL: https://codereview.chromium.org/773443002

Cr-Commit-Position: refs/heads/master@{#25587}

Review URL: https://codereview.chromium.org/770783003

Cr-Commit-Position: refs/heads/master@{#25586}

BUG=chromium:437143
LOG=N

Review URL: https://codereview.chromium.org/768113002

Cr-Commit-Position: refs/heads/master@{#25585}

BUG=

Review URL: https://codereview.chromium.org/757103003

Cr-Commit-Position: refs/heads/master@{#25584}

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/767743003

Cr-Commit-Position: refs/heads/master@{#25583}

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/764863002

Patch from Weiliang Lin <weiliang.lin@intel.com>.

Cr-Commit-Position: refs/heads/master@{#25582}

BUG=v8:3663
LOG=N

Review URL: https://codereview.chromium.org/753993003

Cr-Commit-Position: refs/heads/master@{#25581}

Only use "addl" and "subl" in cases that have been measured to be
faster (currently only immediate operations).

Review URL: https://codereview.chromium.org/735293004

Cr-Commit-Position: refs/heads/master@{#25580}

BUG=v8:3730
LOG=N
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/750093003

Cr-Commit-Position: refs/heads/master@{#25579}

BUG=v8:3728
R=machenbach@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/764263002

Cr-Commit-Position: refs/heads/master@{#25578}

R=rossberg@chromium.org
TBR=hpayer@chromium.org

Committed: https://chromium.googlesource.com/v8/v8/+/d6285620868b15c84eb9affa59f6b4e869f074b8

Review URL: https://codereview.chromium.org/763273002

Cr-Commit-Position: refs/heads/master@{#25577}

This is basically a refactoring that extracts desktop
specific code into a separate class.

Also adds flags for android runs (not used yet).

BUG=chromium:374740
LOG=n
TEST=python -m unittest run_perf_test
NOTRY=true

Review URL: https://codereview.chromium.org/762163002

Cr-Commit-Position: refs/heads/master@{#25576}