X87: Fixed flooring division by a power of 2, once again...

X87: Fixed flooring division by a power of 2, once again...

port r21769

original message:
    Avoid right shifts by zero bits: On ARM it actually means shifting by
    32 bits (correctness issue) and on other platforms they are useless
    (performance issue). This is fix for the fix in r20544.
    
    BUG=v8:3259
LOG=y

[chunyang.dai, 2014-06-13 03:25:05]

wl.
please review and commit this patch.
thanks.

[Weiliang, 2014-06-13 03:44:39]

lgtm

[commit-bot: I haz the power, 2014-06-13 03:45:33]

CQ is trying da patch. Follow status at
 https://v8-status.appspot.com/cq/chunyang.dai@intel.com/330133004/1

[commit-bot: I haz the power, 2014-06-13 03:45:34]

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

[commit-bot: I haz the power, 2014-06-13 03:45:35]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Sven Panne, 2014-06-13 06:42:16]

FYI: We don't really have a commit queue for v8 yet (only try bots), so Weiliang
has to commit this by hand...

[Weiliang, 2014-06-13 07:05:58]

Committed as r21829