X87: [runtime] Drop redundant %CharFromCode runtime entry.

X87: [runtime] Drop redundant %CharFromCode runtime entry.

  port 2b4cb2a14011404e7d20341bdc91d890a4584a18 (r31873)

  original commit message:
  The %StringCharFromCode and %CharFromCode runtime function perform
  exactly the same task, so we need only one of them.

BUG=

Committed: https://crrev.com/12a073e69a7631ba032d2e3996892c921481f420
Cr-Commit-Position: refs/heads/master@{#31909}

[zhengxing.li, 2015-11-10 02:01:32]

zhengxing.li@intel.com changed reviewers:
+ chunyang.dai@intel.com, weiliang.lin@intel.com

[Weiliang, 2015-11-10 02:06:22]

The CQ bit was checked by weiliang.lin@intel.com

[Weiliang, 2015-11-10 02:06:22]

lgtm

[commit-bot: I haz the power, 2015-11-10 02:06:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1432063002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1432063002/1

[commit-bot: I haz the power, 2015-11-10 02:25:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-10 02:25:30]

Patchset 1 (id:??) landed as
https://crrev.com/12a073e69a7631ba032d2e3996892c921481f420
Cr-Commit-Position: refs/heads/master@{#31909}