Fix fast API call for MinGW-w64

Fix fast API call for MinGW-w64

MinGW-w64 uses the rcx register for the first argument. Unlike MSVC, it does not require preparing a slot for the result handle on the stack and putting a pointer to it in the rcx register.

BUGS=v8:2026
TEST=cctest/test-api

Committed: https://code.google.com/p/v8/source/detail?r=11325

[ulan, 2012-04-03 16:57:19]

Sorry, I am not familiar with MinGW-w64.

Could you please explain why renaming the registers helps here?

I searched for a calling convention spec of MinGW-w64. So far I found this
(http://sourceforge.net/apps/trac/mingw-w64/wiki/MinGW%20x64%20Software%20conv...)
but it looks exactly like MS calling convention.

[Net147, 2012-04-08 11:41:21]

I've updated the description with more information.

[ulan, 2012-04-16 08:58:19]

LGTM, I will land it for you.

[Net147, 2012-04-16 10:27:12]

http://code.google.com/p/v8/issues/detail?id=2026 can be closed now.