Add ability to bail out from custom call generators to x64 and ARM platforms.

Add ability to bail out from custom call generators to x64 and ARM platforms.

http://code.google.com/p/v8/source/detail?r=4503 added this functionality to ia32.

Committed: http://code.google.com/p/v8/source/detail?r=4549

[antonm, 2010-04-27 15:07:19]

Lasse,

that's a follow up to 4503.

[Lasse Reichstein, 2010-04-29 12:59:06]

LGTM