[wasm][asm.js] Fix incorrect stack depth in some returns.

[wasm][asm.js] Fix incorrect stack depth in some returns.

Previously we allowed unreachable returns to be skipped.
This won't work if we strictly follow the spec.

BUG=None
TEST=Manual against more strict wasm validation
R=titzer@chromium.org,rossberg@chromium.org

Review-Url: https://codereview.chromium.org/2668873003
Cr-Commit-Position: refs/heads/master@{#42833}
Committed: https://chromium.googlesource.com/v8/v8/+/8cee1e7e17a58262b76b7fe48c2318eb2efca609

[bradnelson, 2017-02-01 02:58:06]

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

[commit-bot: I haz the power, 2017-02-01 02:58:07]

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

[bradn, 2017-02-01 02:58:18]

bradnelson@google.com changed reviewers:
+ bradnelson@google.com

[commit-bot: I haz the power, 2017-02-01 03:43:34]

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

[commit-bot: I haz the power, 2017-02-01 03:43:35]

Dry run: This issue passed the CQ dry run.

[titzer, 2017-02-01 03:53:54]

lgtm

[bradn, 2017-02-01 04:02:39]

The CQ bit was checked by bradnelson@google.com

[commit-bot: I haz the power, 2017-02-01 04:02:49]

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, 2017-02-01 04:04:46]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1485921759963870, "parent_rev":
"7e2cc99331a3c0da73aedca8708a1492ae6ea991", "commit_rev":
"8cee1e7e17a58262b76b7fe48c2318eb2efca609"}

[commit-bot: I haz the power, 2017-02-01 04:04:52]

Description was changed from

==========
[wasm][asm.js] Fix incorrect stack depth in some returns.

Previously we allowed unreachable returns to be skipped.
This won't work if we strictly follow the spec.

BUG=None
TEST=Manual against more strict wasm validation
R=titzer@chromium.org,rossberg@chromium.org
==========

to

==========
[wasm][asm.js] Fix incorrect stack depth in some returns.

Previously we allowed unreachable returns to be skipped.
This won't work if we strictly follow the spec.

BUG=None
TEST=Manual against more strict wasm validation
R=titzer@chromium.org,rossberg@chromium.org

Review-Url: https://codereview.chromium.org/2668873003
Cr-Commit-Position: refs/heads/master@{#42833}
Committed:
https://chromium.googlesource.com/v8/v8/+/8cee1e7e17a58262b76b7fe48c2318eb2ef...
==========

[commit-bot: I haz the power, 2017-02-01 04:04:54]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/8cee1e7e17a58262b76b7fe48c2318eb2ef...