X87: Introduce LanguageMode, drop StrictMode.

X87: Introduce LanguageMode, drop StrictMode.

port c7851da4aefb644ab198ead1fa284932fd424797 (r26419)

original commit message:

  Introduce LanguageMode, drop StrictMode.

  This enables adding more language modes in the future.

  For maximum flexibility, LanguageMode is a bitmask, so we're not restricted to
  use a sequence of language modes which are progressively stricter, but we can
  express the language mode as combination of features.

  For now, LanguageMode can only be "sloppy" or "strict", and there are
  STATIC_ASSERTS in places which need to change when more modes are added.

  LanguageMode is a bit like the old LanguageMode when "extended" mode was still
  around (see https://codereview.chromium.org/8417035 and
  https://codereview.chromium.org/181543002 ) except that it's transmitted through
  all the layers (there's no StrictModeFlag).

BUG=
R=weiliang.lin@intel.com

Committed: https://chromium.googlesource.com/v8/v8/+/4ee51619620ae86a27fc5ad7c3d24240ed880303

[chunyang.dai, 2015-02-09 08:41:19]

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

[chunyang.dai, 2015-02-09 08:42:40]

PTAL.
thanks

[Weiliang, 2015-02-09 08:48:02]

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

[Weiliang, 2015-02-09 08:48:03]

lgtm

[commit-bot: I haz the power, 2015-02-09 08:48:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/902053005/1

[commit-bot: I haz the power, 2015-02-09 08:50:20]

Patchset 1 (id:??) landed as
https://crrev.com/4ee51619620ae86a27fc5ad7c3d24240ed880303
Cr-Commit-Position: refs/heads/master@{#26514}

[chunyang.dai, 2015-02-09 08:50:28]

Committed patchset #1 (id:1) manually as
4ee51619620ae86a27fc5ad7c3d24240ed880303 (presubmit successful).