[wasm] Turn on parallel compilation by default.

[wasm] Turn on parallel compilation by default.

This CL sets the default value of the flag wasm_num_compilation_tasks to 10.
The actual number of compilation tasks is the minimum of the flag value and
V8::GetCurrentPlatform()->NumberOfAvailableBackgroundThreads(), which is 8
on my machine.

R=titzer@chromium.org

Committed: https://crrev.com/6c3d43766e514dd6940c76a7152cc3f18ccc41ee
Cr-Commit-Position: refs/heads/master@{#36892}

[titzer, 2016-06-10 11:30:26]

LGTM!

[ahaas, 2016-06-10 11:47:18]

The CQ bit was checked by ahaas@chromium.org

[commit-bot: I haz the power, 2016-06-10 11:47:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2054093002/1

[commit-bot: I haz the power, 2016-06-10 11:58:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-10 12:00:47]

Description was changed from

==========
[wasm] Turn on parallel compilation by default.

This CL sets the default value of the flag wasm_num_compilation_tasks to 10.
The actual number of compilation tasks is the minimum of the flag value and
V8::GetCurrentPlatform()->NumberOfAvailableBackgroundThreads(), which is 8
on my machine.

R=titzer@chromium.org
==========

to

==========
[wasm] Turn on parallel compilation by default.

This CL sets the default value of the flag wasm_num_compilation_tasks to 10.
The actual number of compilation tasks is the minimum of the flag value and
V8::GetCurrentPlatform()->NumberOfAvailableBackgroundThreads(), which is 8
on my machine.

R=titzer@chromium.org

Committed: https://crrev.com/6c3d43766e514dd6940c76a7152cc3f18ccc41ee
Cr-Commit-Position: refs/heads/master@{#36892}
==========

[commit-bot: I haz the power, 2016-06-10 12:00:47]

Patchset 1 (id:??) landed as
https://crrev.com/6c3d43766e514dd6940c76a7152cc3f18ccc41ee
Cr-Commit-Position: refs/heads/master@{#36892}