Preserve required MS x64 call stack alignment when flushing registers.

Preserve required MS x64 call stack alignment when flushing registers.

The Microsoft x64 calling convention also requires a 16-byte stack
alignment on invocation of "call"; adjust pushAllRegisters stack usage
accordingly.

( From patch contributed by ilya.berdichevsky )

R=haraken
BUG=446479
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190539

[sof, 2015-02-19 19:14:14]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2015-02-19 19:14:14]

Please take a look.

A latent issue, for now.

[haraken, 2015-02-19 23:12:21]

rubberstamp LGTM (I'm not familiar with asm :-)

[sof, 2015-02-20 06:30:42]

On 2015/02/19 23:12:21, haraken wrote:
> rubberstamp LGTM (I'm not familiar with asm :-)

I verified in a local build that the alignment indeed wasn't a multiple of 16,
and applied the same kind of adjustment as is done for x86_64 just above.

[sof, 2015-02-20 06:30:45]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-02-20 06:31:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/941763002/1

[commit-bot: I haz the power, 2015-02-20 07:52:34]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=190539