Port 1b230799

Original commit message:
    Int64Add is lowered to a new turbofan operator, Int32AddPair. The new
    operator takes 4 inputs an generates 2 outputs. The inputs are the low
    word of the left input, high word of the left input, the low word of the
    right input, and high word of the right input. The ouputs are the low
    and high word of the result of the addition.

R=ahaas@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1803113002

Cr-Commit-Position: refs/heads/master@{#34797}

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

Review URL: https://codereview.chromium.org/1797383002

Cr-Commit-Position: refs/heads/master@{#34796}

R=danno@chromium.org,jkummerow@chromium.org,jochen@chromium.org,joransiu@ca.ibm.com,michael_dawson@ca.ibm.com,mbrandy@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1805533002

Cr-Commit-Position: refs/heads/master@{#34795}

BUG=v8:4247
LOG=y

Review URL: https://codereview.chromium.org/1803903002

Cr-Commit-Position: refs/heads/master@{#34794}

Use script_url when the script name is not available.

BUG=chromium:463108
LOG=N

Review URL: https://codereview.chromium.org/1796353002

Cr-Commit-Position: refs/heads/master@{#34793}

Stub code traces should also be redirected to the file specified by the user.

R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1795873002

Cr-Commit-Position: refs/heads/master@{#34792}

R=ahaas@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1806533002

Cr-Commit-Position: refs/heads/master@{#34791}

Updates InlineTwice to declare a function and then return a function
instead of using function expressions by wrapping a function with '('
and ')'. The earlier implementation would cause the function to
compile immediately instead of lazy compile. Also updates cctest.status

BUG=v8:4280,v8:4837,v8:4680
LOG=N

Review URL: https://codereview.chromium.org/1800073002

Cr-Commit-Position: refs/heads/master@{#34790}

R=danno@chromium.org,jkummerow@chromium.org,jochen@chromium.org,joransiu@ca.ibm.com,michael_dawson@ca.ibm.com,mbrandy@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1802343002

Cr-Commit-Position: refs/heads/master@{#34789}

BUG=v8:4680
LOG=N
TBR=machenbach@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1801033002

Cr-Commit-Position: refs/heads/master@{#34788}

Upstream S390 platform specific code to latest lkgr from the past 2 weeks.

R=danno@chromium.org,jkummerow@chromium.org,jochen@chromium.org,joransiu@ca.ibm.com,michael_dawson@ca.ibm.com,mbrandy@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1799893002

Cr-Commit-Position: refs/heads/master@{#34787}

Sometimes v8.log entries are cut off, and leave an unpaired quote.
Since the log is piped into d8 to run the tick processor, that quote
is interpreted to escape a line break.

This fix makes sure that we break lines even with unpaired quotes.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1802303002

Cr-Commit-Position: refs/heads/master@{#34786}

The implementation is done by storing to and then loading from memory.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1801013002

Cr-Commit-Position: refs/heads/master@{#34785}

The implementation is done by storing to and loading from memory.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1804953002

Cr-Commit-Position: refs/heads/master@{#34784}

This should recover a part of the regression caused by 7f11fba7 (https://codereview.chromium.org/1739233002).

BUG=chromium:592692
LOG=N

Review URL: https://codereview.chromium.org/1793293003

Cr-Commit-Position: refs/heads/master@{#34783}

The tests require the implementation of Int32PairAdd and Word32PairShl.

R=titzer@chromium.org, v8-mips-ports@googlegroups.com

Review URL: https://codereview.chromium.org/1804913002

Cr-Commit-Position: refs/heads/master@{#34782}

R=rmcilroy@chromium.org, vogelheim@chromium.org
BUG=v8:4690
LOG=N

Review URL: https://codereview.chromium.org/1802903002

Cr-Commit-Position: refs/heads/master@{#34781}

[turbofan] Fix double object allocation when inlining a construct call of a derived class or an Api function.

Review URL: https://codereview.chromium.org/1798373002

Cr-Commit-Position: refs/heads/master@{#34780}

BUG=

Review URL: https://codereview.chromium.org/1792283007

Cr-Commit-Position: refs/heads/master@{#34779}

BUG=

Review URL: https://codereview.chromium.org/1806443002

Cr-Commit-Position: refs/heads/master@{#34778}

Word64Popcnt is lowered to Word32Popcnt(low-word) + Word32Popcnt(high_word).
Since the optional Word64Popcnt operator does not exist on 32 bit platforms,
I introduced a new operator "Word64PopcntPlaceholder" which is generated
in the WasmCompiler and then lowered in the Int64Lowering.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1803453003

Cr-Commit-Position: refs/heads/master@{#34777}

BUG=chromium:594103
LOG=n

Review URL: https://codereview.chromium.org/1801013003

Cr-Commit-Position: refs/heads/master@{#34776}

BUG=

Review URL: https://codereview.chromium.org/1794233006

Cr-Commit-Position: refs/heads/master@{#34775}

BUG=v8:4280
LOG=n
TBR=rmcilroy@chromium.org, mstarzinger@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1804013002

Cr-Commit-Position: refs/heads/master@{#34774}

BUG=v8:4280
LOG=n
TBR=rmcilroy@chromium.org, mstarzinger@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1797203002

Cr-Commit-Position: refs/heads/master@{#34773}

BUG=v8:4280
LOG=n
TBR=rmcilroy@chromium.org, mstarzinger@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1799423004

Cr-Commit-Position: refs/heads/master@{#34772}

We may not emit bytecode for the evaluation of the to-be-returned
expression. In that case we cannot set two return positions for a return
statement (one before and one after the expression evaluation). This
sets the interpreter apart from full-codegen.

Make sure that we always have the second of the two return positions.

Note that we end up with separate test cases for ignition and FCG.

R=rmcilroy@chromium.org, vogelheim@chromium.org
BUG=v8:4690
LOG=N

Review URL: https://codereview.chromium.org/1801473003

Cr-Commit-Position: refs/heads/master@{#34771}

Cr-Commit-Position: refs/heads/master@{#34770}

Implementation of https://codereview.chromium.org/1768233002 on arm.

R=titzer@chromium.org, v8-arm-ports@googlegroups.com

Review URL: https://codereview.chromium.org/1778893004

Cr-Commit-Position: refs/heads/master@{#34769}

On 32-bit systems these instructions are compiled to calls to
C functions. The TF node for the function call is already generated in
the wasm compiler, the lowering of the I64 parameters is done in the
Int64Lowering. We use the return value of the C function to determine
whether the calculation should trap or not.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1804513002

Cr-Commit-Position: refs/heads/master@{#34768}

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1798993002

Cr-Commit-Position: refs/heads/master@{#34767}

The warning notes that we'd want a 'w' register here because the size of
the operand is 32-bit, however, the instruction only takes an 'x'
register and so force that using the 'x' modifier on the instruction.

BUG=

Review URL: https://codereview.chromium.org/1799263002

Cr-Commit-Position: refs/heads/master@{#34766}

Rolling v8/tools/clang to c642451e861b9c568967fb8e4d9d3fd081699162

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

Review URL: https://codereview.chromium.org/1803953002

Cr-Commit-Position: refs/heads/master@{#34765}

Modules already have a separate entrypoint into the engine (at the moment,
this is v8::ScriptCompiler::CompileModule, though that will change to
something like ParseModule). This meant that requiring a commandline flag
simply added an extra complexity burden on embedders. By removing the v8
flag, this lets embedders use their own flagging mechanism (such as d8's
"--module", or Blink's RuntimeEnabledFeatures) to control whether
modules are to be used.

Also remove old modules tests that were being skipped (since they test
very old, pre-ES2015 modules syntax).

R=littledan@chromium.org
BUG=v8:1569, chromium:594639
LOG=y

Review URL: https://codereview.chromium.org/1804693002

Cr-Commit-Position: refs/heads/master@{#34764}

test262 "negative" test expectations list which exception is thrown. The ES2017
draft specification is very specific about which exception class is thrown
from which path, and V8 works hard to be correct with respect to that spec.

Previously, the test262 test runner would accept any nonzero status code,
such as from a crash, or a FAIL printed out, for a negative test. This
patch makes negative tests check for the right answer using a quick-and-dirty
parsing of the exception printing from d8 to find the exception class.
It invokes d8 in a way to get a status code of 0 from thrown exceptions
so that 'negative' tests aren't actually implemented by negating the output.

Amazingly, this didn't catch any test262 failures, but I verified the extra
checking interactively by changing a negative test to expect a different type
and saw it fail.

BUG=v8:4803
R=machenbach
LOG=Y

Review URL: https://codereview.chromium.org/1766503002

Cr-Commit-Position: refs/heads/master@{#34763}

BUG=chromium:561449
LOG=n

Review URL: https://codereview.chromium.org/1800733002

Cr-Commit-Position: refs/heads/master@{#34762}

R=vogelheim@chromium.org
BUG=chromium:594551
LOG=N

Review URL: https://codereview.chromium.org/1804433004

Cr-Commit-Position: refs/heads/master@{#34761}

BUG=chromium:561449
LOG=n

Review URL: https://codereview.chromium.org/1794383004

Cr-Commit-Position: refs/heads/master@{#34760}

This fixes the label binding mechanism that forwards a label to another
already bound target label. For source labels that are not being reached
by a jump, we should not try to patch jump sites. We still bind the
source label to reflect the target position though, just in case this
binding method will be used for backwards branches in the future.

R=rmcilroy@chromium.org
TEST=webkit/fast/js/parser-syntax-check

Review URL: https://codereview.chromium.org/1804643002

Cr-Commit-Position: refs/heads/master@{#34759}

HandleApiCall is one of the most heavily used builtins on Node.js.
Replace some old CHECKs with DCHECKs.

R=ishell@chromium.org, jochen@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1804433005

Cr-Commit-Position: refs/heads/master@{#34758}