Port 68cc0be2

Original commit message:
The TruncateFloat32ToUint64 operator converts a float32 to an uint64 using
round-to-zero rounding mode. If the input value is outside uint64 range, then
the result depends on the architecture. I provide an implementation for x64 and
arm64.

BUG=

Review URL: https://codereview.chromium.org/1481093003

Cr-Commit-Position: refs/heads/master@{#32383}

This makes sure that proxy + Function/Array works
Makes sure that new.target can be a generator
Makes sure that if new.target is not a subclass, but does not have a prototype, that we'll get that same prototype back the next time we look at new.target.prototype.

BUG=v8:1543, v8:3330, v8:3931
LOG=n

Review URL: https://codereview.chromium.org/1484473002

Cr-Commit-Position: refs/heads/master@{#32382}

Previously all contexts had a link to the global object, but what is
required in most cases (except for the global load, store and delete
case) is the native context.

This also removes the second dummy global object that was still linked
to every native context. We will add a different mechanism to ensure
that builtins do not pollute the actual global object during
bootstrapping.

Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_rel
R=yangguo@chromium.org,mstarzinger@chromium.org

Committed: https://crrev.com/d290f204938295bfecc5c8e645ccfcff6e80ddb8
Cr-Commit-Position: refs/heads/master@{#32375}

Review URL: https://codereview.chromium.org/1480003002

Cr-Commit-Position: refs/heads/master@{#32381}

And add a presubmit check to guard against future duplicates.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1477403002

Cr-Commit-Position: refs/heads/master@{#32380}

The TruncateFloat32ToUint64 operator converts a float32 to an uint64 using
round-to-zero rounding mode. If the input value is outside uint64 range, then
the result depends on the architecture. I provide an implementation for x64 and
arm64.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1479713003

Cr-Commit-Position: refs/heads/master@{#32379}

BUG=

Review URL: https://codereview.chromium.org/1472363007

Cr-Commit-Position: refs/heads/master@{#32378}

Revert of [runtime] Replace global object link with native context link in all contexts. (patchset #3 id:40001 of https://codereview.chromium.org/1480003002/ )

Reason for revert:
[Sheriff] Breaks:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap/builds/5472

Original issue's description:
> [runtime] Replace global object link with native context link in all contexts.
>
> Previously all contexts had a link to the global object, but what is
> required in most cases (except for the global load, store and delete
> case) is the native context.
>
> This also removes the second dummy global object that was still linked
> to every native context. We will add a different mechanism to ensure
> that builtins do not pollute the actual global object during
> bootstrapping.
>
> Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.
>
> R=yangguo@chromium.org
>
> Committed: https://crrev.com/d290f204938295bfecc5c8e645ccfcff6e80ddb8
> Cr-Commit-Position: refs/heads/master@{#32375}

TBR=yangguo@chromium.org,mstarzinger@chromium.org,bmeurer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1478303002

Cr-Commit-Position: refs/heads/master@{#32377}

Requires passing an explicit Isolate* to a bunch of static Assembler
methods.

BUG=v8:2487
R=yangguo@chromium.org,jkummerow@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1474323002

Cr-Commit-Position: refs/heads/master@{#32376}

Previously all contexts had a link to the global object, but what is
required in most cases (except for the global load, store and delete
case) is the native context.

This also removes the second dummy global object that was still linked
to every native context. We will add a different mechanism to ensure
that builtins do not pollute the actual global object during
bootstrapping.

Drive-by-fix: Unify some MacroAssembler magic and drop obsolete stuff.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1480003002

Cr-Commit-Position: refs/heads/master@{#32375}

This replaces internal GetConstructorName with toStringTag, .constructor's name
and class_name. This entirely changes how the name is computed for use in
devtools.

BUG=chromium:529177
LOG=n

Review URL: https://codereview.chromium.org/1435273002

Cr-Commit-Position: refs/heads/master@{#32374}

This will allow moving the test outcome check beyond the
multi-process boundary in a follow up. It'll allow wrapping
more complex test jobs like predicable mode on the multi-
process side, which will make the code easier to maintain.

BUG=

Review URL: https://codereview.chromium.org/1469833002

Cr-Commit-Position: refs/heads/master@{#32373}

BUG=chromium:548562
LOG=n

Review URL: https://codereview.chromium.org/1474303002

Cr-Commit-Position: refs/heads/master@{#32372}

It needs ot to flush icaches all over the place

BUG=v8:2487
LOG=n
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1477343002

Cr-Commit-Position: refs/heads/master@{#32371}

BUG=v8:1543, v8:3330, v8:3931
LOG=n

Review URL: https://codereview.chromium.org/1481773003

Cr-Commit-Position: refs/heads/master@{#32370}

BUG=

Review URL: https://codereview.chromium.org/1476413002

Cr-Commit-Position: refs/heads/master@{#32369}

Do not remove write barriers for stores of old space references in most recent old space allocation.

BUG=chromium:561449
LOG=n

Review URL: https://codereview.chromium.org/1478113002

Cr-Commit-Position: refs/heads/master@{#32368}

Fix gcc 4.9.2 signed-compare warnings/errors.

BUG=

Review URL: https://codereview.chromium.org/1476473002

Cr-Commit-Position: refs/heads/master@{#32367}

These instructions now show FCSR in disassembly, instead f31

BUG=

Review URL: https://codereview.chromium.org/1481023002

Cr-Commit-Position: refs/heads/master@{#32366}

BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1481873002

Cr-Commit-Position: refs/heads/master@{#32365}

BUG=chromium:535160, chromium:561530
TBR=tandrii@chromium.org, sergiyb@chromium.org, akuegel@chromium.org
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1479003004

Cr-Commit-Position: refs/heads/master@{#32364}

The effect chain should be respected for context loads and stores.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1479793003

Cr-Commit-Position: refs/heads/master@{#32363}

BUG=

Review URL: https://codereview.chromium.org/1474203003

Cr-Commit-Position: refs/heads/master@{#32362}

Compaction selection now derives target fragmentation based on compaction speed
and a goal per page, if compaction speed has been traced. This way we avoid
overlong compaction of single pages.

This change could regress memory consumption if (a) the memory reducer does not
kick in, and (b) lots of medium fragmented pages would be compacted in our fast
path.

BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1480553004

Cr-Commit-Position: refs/heads/master@{#32361}

BUG=chromium:562227
LOG=n

Review URL: https://codereview.chromium.org/1479893002

Cr-Commit-Position: refs/heads/master@{#32360}

BUG=v8:2487
R=yangguo@chromium.org,jkummerow@chromium.org,mstarzinger@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1474763008

Cr-Commit-Position: refs/heads/master@{#32359}

  port 199bbdb4 (r32351)

  original commit message:
  Moves all files related to AST and scopes into ast/,
  and all files related to scanner & parser to parsing/.

  Also eliminates a couple of spurious dependencies.

BUG=

Review URL: https://codereview.chromium.org/1476353002

Cr-Commit-Position: refs/heads/master@{#32358}

  port 81e131ce (r32339)

  original commit message:

BUG=

Review URL: https://codereview.chromium.org/1474993004

Cr-Commit-Position: refs/heads/master@{#32357}

  port d3e5db04 (r32336)

  original commit message:
  Up until now we sometimes pass Smi 0 around as closure and expect the
  runtime to translate that appropriately. But we need to be careful in
  some places to not confuse the Smi 0 with a real closure. However, we
  could instead just pass the correct closure extracted from the native
  context.

  This addresses three long-standing TODOs in the JSTypedLowering pass.

  Drive-by-fix: Further unify error message reporting for ToObject (we had
  a special message in case of ToObject error in with context creation).

BUG=

Review URL: https://codereview.chromium.org/1474243002

Cr-Commit-Position: refs/heads/master@{#32356}

Rolling v8/tools/clang to 865186d384b106af211dcfaf2ab3f4e778773098

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

Review URL: https://codereview.chromium.org/1474273002

Cr-Commit-Position: refs/heads/master@{#32355}

BUG=None
LOG=n

Review URL: https://codereview.chromium.org/1473023004

Cr-Commit-Position: refs/heads/master@{#32354}

BUG=none
R=jkummerow@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1477243002

Cr-Commit-Position: refs/heads/master@{#32353}

BUG=chromium:535160, chromium:561530
TBR=tandrii@chromium.org, sergiyb@chromium.org,
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1481763003

Cr-Commit-Position: refs/heads/master@{#32352}

Moves all files related to AST and scopes into ast/,
and all files related to scanner & parser to parsing/.

Also eliminates a couple of spurious dependencies.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1481613002

Cr-Commit-Position: refs/heads/master@{#32351}

Revert of [Proxies] Support constructable proxy as new.target (patchset #3 id:40001 of https://codereview.chromium.org/1481613003/ )

Reason for revert:
[Sheriff] Breaks:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug/builds/3977

Original issue's description:
> [Proxies] Support constructable proxy as new.target
>
> BUG=v8:1543, v8:3330, v8:3931
> LOG=n
>
> Committed: https://crrev.com/88ac8aa5236195137d4a7aa18bcc5650a3bdca5a
> Cr-Commit-Position: refs/heads/master@{#32346}

TBR=ishell@chromium.org,verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:1543, v8:3330, v8:3931

Review URL: https://codereview.chromium.org/1480673004

Cr-Commit-Position: refs/heads/master@{#32350}

Create a visitor for evacuating objects for young and old generation. This is
the first step of preparing a task to process, both,  newspace and oldspace
pages in parallel.

BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1470253002

Cr-Commit-Position: refs/heads/master@{#32349}

It's not used anywhere.

BUG=none
LOG=y
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1477213002

Cr-Commit-Position: refs/heads/master@{#32348}

TEST=
BUG=

Review URL: https://codereview.chromium.org/1477043004

Cr-Commit-Position: refs/heads/master@{#32347}

BUG=v8:1543, v8:3330, v8:3931
LOG=n

Review URL: https://codereview.chromium.org/1481613003

Cr-Commit-Position: refs/heads/master@{#32346}

In preparation for implementing proper Proxy support.

Review URL: https://codereview.chromium.org/1466243002

Cr-Commit-Position: refs/heads/master@{#32345}

BUG=v8:2487
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1480883002

Cr-Commit-Position: refs/heads/master@{#32344}