[wasm] Use ChangeSmiToInt32 instead of SmiConstant in wasm.

[wasm] Use ChangeSmiToInt32 instead of SmiConstant in wasm.

Signature indices are encoded as SMIs in the function table of a wasm
module. To compare a signature index with the index parameter that is
passed to an indirect function call, we now change the signature index
to an int32 instead of encoding the index parameter as a SmiConstant.
SmiConstants get encoded as NumberConstant nodes in the TF graph, which
can cause the allocation of heap numbers. Heap allocation has to be
avoided for parallel compilation.

R=bradnelson@chromium.org, titzer@chromium.org

Committed: https://crrev.com/4b8128a051b6661b13fe9b0e31fb903c0fcf04b6
Cr-Commit-Position: refs/heads/master@{#37240}

[bradnelson, 2016-06-23 17:40:01]

The CQ bit was checked by bradnelson@chromium.org

[bradnelson, 2016-06-23 17:40:01]

lgtm

[commit-bot: I haz the power, 2016-06-23 17:40:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2090923002/1

[commit-bot: I haz the power, 2016-06-23 17:43:43]

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

[commit-bot: I haz the power, 2016-06-23 17:43:44]

Try jobs failed on following builders:
  v8_presubmit on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/17900)

[Benedikt Meurer, 2016-06-24 07:18:47]

bmeurer@chromium.org changed reviewers:
+ bmeurer@chromium.org

[Benedikt Meurer, 2016-06-24 07:18:47]

lgtm

[ahaas, 2016-06-24 07:19:34]

The CQ bit was checked by ahaas@chromium.org

[commit-bot: I haz the power, 2016-06-24 07:19:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2090923002/1

[commit-bot: I haz the power, 2016-06-24 07:21:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-24 07:23:55]

Description was changed from

==========
[wasm] Use ChangeSmiToInt32 instead of SmiConstant in wasm.

Signature indices are encoded as SMIs in the function table of a wasm
module. To compare a signature index with the index parameter that is
passed to an indirect function call, we now change the signature index
to an int32 instead of encoding the index parameter as a SmiConstant.
SmiConstants get encoded as NumberConstant nodes in the TF graph, which
can cause the allocation of heap numbers. Heap allocation has to be
avoided for parallel compilation.


R=bradnelson@chromium.org, titzer@chromium.org
==========

to

==========
[wasm] Use ChangeSmiToInt32 instead of SmiConstant in wasm.

Signature indices are encoded as SMIs in the function table of a wasm
module. To compare a signature index with the index parameter that is
passed to an indirect function call, we now change the signature index
to an int32 instead of encoding the index parameter as a SmiConstant.
SmiConstants get encoded as NumberConstant nodes in the TF graph, which
can cause the allocation of heap numbers. Heap allocation has to be
avoided for parallel compilation.

R=bradnelson@chromium.org, titzer@chromium.org

Committed: https://crrev.com/4b8128a051b6661b13fe9b0e31fb903c0fcf04b6
Cr-Commit-Position: refs/heads/master@{#37240}
==========

[commit-bot: I haz the power, 2016-06-24 07:23:56]

Patchset 1 (id:??) landed as
https://crrev.com/4b8128a051b6661b13fe9b0e31fb903c0fcf04b6
Cr-Commit-Position: refs/heads/master@{#37240}