[runtime] Simplify TO_INT32/TO_UINT32 abstract operations.

[runtime] Simplify TO_INT32/TO_UINT32 abstract operations.

No need to provide TO_INT32/TO_UINT32 functions for every native
context, as they can be implemented in terms of TO_NUMBER more easily
and efficiently.

Also remove the obsolete TO_BOOLEAN_FUN_INDEX from the native contexts.

Committed: https://crrev.com/3cc7adc7c4c12d3b054f904359a170b4a5ad43b4
Cr-Commit-Position: refs/heads/master@{#30080}

[Benedikt Meurer, 2015-08-06 20:08:44]

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

[Benedikt Meurer, 2015-08-06 20:08:44]

Hey Yang,

This is trivial cleanup.
Please take a look.

Thanks,
Benedikt

[Benedikt Meurer, 2015-08-09 18:50:23]

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

[commit-bot: I haz the power, 2015-08-09 18:50:26]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1275013004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1275013004/1

[commit-bot: I haz the power, 2015-08-09 19:14:59]

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

[commit-bot: I haz the power, 2015-08-09 19:15:00]

Dry run: This issue passed the CQ dry run.

[Jarin, 2015-08-10 04:51:11]

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

[Jarin, 2015-08-10 04:51:12]

lgtm

[Benedikt Meurer, 2015-08-10 04:52:49]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-08-10 04:52:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1275013004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1275013004/1

[commit-bot: I haz the power, 2015-08-10 04:54:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-10 04:54:47]

Patchset 1 (id:??) landed as
https://crrev.com/3cc7adc7c4c12d3b054f904359a170b4a5ad43b4
Cr-Commit-Position: refs/heads/master@{#30080}