MIPS: Generator objects can suspend

MIPS: Generator objects can suspend

Port r14353 (f4bb81d1)

Original commit message:
* src/ast.h:
* src/parser.cc: Differentiate between the different kinds of yields, in
  anticipation of boxing return values.  Parse `return' into `yield' in
  a generator.

* src/runtime.h:
* src/runtime.cc (Runtime_SuspendJSGeneratorObject): New horrible
  runtime function: saves continuation, context, and operands into the
  generator object.

* src/arm/full-codegen-arm.cc (VisitYield):
* src/ia32/full-codegen-ia32.cc (VisitYield):
* src/x64/full-codegen-x64.cc (VisitYield): Arrange to call
  SuspendJSGeneratorObject.  If the call returns the hole, we suspend.
  Otherwise we resume.

BUG=v8:2355
TEST=These codepaths are tested when the generator is first invoked, and so
are covered by mjsunit/harmony/generators-objects.js.

Committed: https://code.google.com/p/v8/source/detail?r=14363

[Paul Lind, 2013-04-19 19:15:15]

Just a nit to fix....

https://codereview.chromium.org/14091006/diff/1/src/mips/full-codegen-mips.cc
File src/mips/full-codegen-mips.cc (right):

https://codereview.chromium.org/14091006/diff/1/src/mips/full-codegen-mips.cc...
src/mips/full-codegen-mips.cc:1961: JSGeneratorObject::kContinuationOffset));
nit: indentation is off by 1 here.

[palfia, 2013-04-19 19:18:46]

Thanks, fixed.

https://codereview.chromium.org/14091006/diff/1/src/mips/full-codegen-mips.cc
File src/mips/full-codegen-mips.cc (right):

https://codereview.chromium.org/14091006/diff/1/src/mips/full-codegen-mips.cc...
src/mips/full-codegen-mips.cc:1961: JSGeneratorObject::kContinuationOffset));
On 2013/04/19 19:15:15, Paul Lind wrote:
> nit: indentation is off by 1 here.

Done.

[Paul Lind, 2013-04-19 19:20:09]

Thanks, LGTM!

[palfia, 2013-04-19 19:23:11]

Committed manually as r14363 (presubmit successful).