Uses #pragma GCC reset_options to re-enable optimizations after ReduceLarge function

Uses "#pragma GCC reset_options" to re-enable optimizations after ReduceLarge function

This ensures that compiler optimizations are restored to the state as it was before ReduceLarge function. Previous CL https://codereview.chromium.org/814273004 could have a possible side effect of enabling "tree-vectorize" optimizations for the rest of the file even when they were disabled in build settings.

BUG=439566
Committed: https://crrev.com/b126eb8f934f25877b0e6d992902e88eac3fec7f
Cr-Commit-Position: refs/heads/master@{#309537}

[varkha, 2014-12-22 16:22:39]

varkha@chromium.org changed reviewers:
+ wez@chromium.org, wtc@chromium.org

[varkha, 2014-12-22 16:22:40]

wez@, as we discussed this should re-enable optimization after ReduceLarge
function only if it was enabled for this file in the first place.
wtc@ for owners review.

[Wez, 2014-12-22 17:26:12]

lgtm

[varkha, 2014-12-22 17:45:07]

varkha@chromium.org changed reviewers:
+ agl@chromium.org

[varkha, 2014-12-22 17:45:07]

+agl@ since he reviewed https://codereview.chromium.org/814273004.

[wtc, 2014-12-23 01:30:12]

Patch set 1 LGTM.

[varkha, 2014-12-23 01:46:56]

The CQ bit was checked by varkha@chromium.org

[commit-bot: I haz the power, 2014-12-23 01:47:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/819893002/1

[commit-bot: I haz the power, 2014-12-23 01:56:33]

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

[commit-bot: I haz the power, 2014-12-23 01:56:34]

Try jobs failed on following builders:
  android_chromium_gn_compile_dbg on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[varkha, 2014-12-23 03:43:00]

Looks like #pragma GCC optimize(push), #pragma GCC optimize(pop), #pragma GCC
push_options, #pragma GCC push_options are all not supported with GCC on Android
but  #pragma GCC reset_options is so landing it that way.

[varkha, 2014-12-23 03:44:19]

The CQ bit was checked by varkha@chromium.org

[commit-bot: I haz the power, 2014-12-23 03:44:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/819893002/40001

[commit-bot: I haz the power, 2014-12-23 04:58:32]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-12-23 04:59:17]

Patchset 3 (id:??) landed as
https://crrev.com/b126eb8f934f25877b0e6d992902e88eac3fec7f
Cr-Commit-Position: refs/heads/master@{#309537}