MIPS: Generators can resume

MIPS: Generators can resume

Port r14415 (d358defa) and r14424 (7b549ce7)

Original commit message:
The generator object methods "next", "send", and "throw" now
include some inline assembly to set up a resumed stack frame.  In some
common cases, we can just jump back into the frame to resume it.
Otherwise the resume code calls out to a runtime to fill in the operand
stack, rewind the handlers, and possibly to throw an exception.

BUG=v8:2355
TESTS=mjsunit/harmony/generators-iteration

Committed: https://code.google.com/p/v8/source/detail?r=14428

[Paul Lind, 2013-04-24 23:06:31]

lgtm

[palfia, 2013-04-24 23:11:55]

Committed manually as r14428 (presubmit successful).