[wasm] Fix {InstantiateAsmJs} builtin on x64.

[wasm] Fix {InstantiateAsmJs} builtin on x64.

This makes sure the {kScratchRegister} is not used across macro
instructions (e.g. {LeaveFrame}) that would clobber its content.
Generally it is highly unsafe to use such scratch registers with a
life-range spanning macro instructions.

R=neis@chromium.org

Committed: https://crrev.com/5894d0e46130ff08eb4a645e63cbc028b9735513
Cr-Commit-Position: refs/heads/master@{#41181}

[Michael Starzinger, 2016-11-22 13:22:47]

The CQ bit was checked by mstarzinger@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-22 13:22:57]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Michael Starzinger, 2016-11-22 13:23:47]

mstarzinger@chromium.org changed reviewers:
+ bradnelson@chromium.org

[Michael Starzinger, 2016-11-22 13:23:48]

Georg: PTAL.
Brad: FYI.

[Michael Starzinger, 2016-11-22 13:24:15]

Description was changed from

==========
[wasm] Fix {InstantiateAsmJs} builtin on x64.

This makes sure the {kScratchRegister} is not used accross macro
instrcutions (e.g. {LeaveFrame}) that would clobber its content.
Generally it is highly unsafe to use such scratch registers with a
life-range spanning macro instructions.

R=neis@chromium.org
==========

to

==========
[wasm] Fix {InstantiateAsmJs} builtin on x64.

This makes sure the {kScratchRegister} is not used across macro
instructions (e.g. {LeaveFrame}) that would clobber its content.
Generally it is highly unsafe to use such scratch registers with a
life-range spanning macro instructions.

R=neis@chromium.org
==========

[neis, 2016-11-22 13:36:19]

lgtm, thanks.

[commit-bot: I haz the power, 2016-11-22 13:51:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-22 13:51:07]

Dry run: This issue passed the CQ dry run.

[Michael Starzinger, 2016-11-22 13:52:25]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2016-11-22 13:52:37]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-22 13:54:31]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1479822745067950, "parent_rev":
"f1132fccefc6728036fd17c93da99129f0b7965b", "commit_rev":
"ef8e73facdd5917ffbdbfdbcf65d7b8b23fe6b9a"}

[commit-bot: I haz the power, 2016-11-22 13:54:36]

Description was changed from

==========
[wasm] Fix {InstantiateAsmJs} builtin on x64.

This makes sure the {kScratchRegister} is not used across macro
instructions (e.g. {LeaveFrame}) that would clobber its content.
Generally it is highly unsafe to use such scratch registers with a
life-range spanning macro instructions.

R=neis@chromium.org
==========

to

==========
[wasm] Fix {InstantiateAsmJs} builtin on x64.

This makes sure the {kScratchRegister} is not used across macro
instructions (e.g. {LeaveFrame}) that would clobber its content.
Generally it is highly unsafe to use such scratch registers with a
life-range spanning macro instructions.

R=neis@chromium.org
==========

[commit-bot: I haz the power, 2016-11-22 13:54:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-22 13:54:58]

Description was changed from

==========
[wasm] Fix {InstantiateAsmJs} builtin on x64.

This makes sure the {kScratchRegister} is not used across macro
instructions (e.g. {LeaveFrame}) that would clobber its content.
Generally it is highly unsafe to use such scratch registers with a
life-range spanning macro instructions.

R=neis@chromium.org
==========

to

==========
[wasm] Fix {InstantiateAsmJs} builtin on x64.

This makes sure the {kScratchRegister} is not used across macro
instructions (e.g. {LeaveFrame}) that would clobber its content.
Generally it is highly unsafe to use such scratch registers with a
life-range spanning macro instructions.

R=neis@chromium.org

Committed: https://crrev.com/5894d0e46130ff08eb4a645e63cbc028b9735513
Cr-Commit-Position: refs/heads/master@{#41181}
==========

[commit-bot: I haz the power, 2016-11-22 13:54:59]

Patchset 1 (id:??) landed as
https://crrev.com/5894d0e46130ff08eb4a645e63cbc028b9735513
Cr-Commit-Position: refs/heads/master@{#41181}