Details wrt parallel recompilation.

Details wrt parallel recompilation.

This includes:
- actually release handles kept by compilation info when compilation completes.
- do not use parallel recompilation on single core CPUs.
- artificially delay parallel recompilation for debugging.
- fix outdated assertions wrt optimization status.
- add "parallel" option to %OptimizeFunctionOnNextCall.


R=jkummerow@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=13827

[Jakob Kummerow, 2013-03-05 14:11:55]

https://chromiumcodereview.appspot.com/12442002/diff/1/src/runtime.cc
File src/runtime.cc (left):

https://chromiumcodereview.appspot.com/12442002/diff/1/src/runtime.cc#oldcode...
src/runtime.cc:7713: function->shared()->code()->set_profiler_ticks(0);
Where did this line go?

[Yang, 2013-03-05 15:57:50]

https://codereview.chromium.org/12442002/diff/1/src/runtime.cc
File src/runtime.cc (left):

https://codereview.chromium.org/12442002/diff/1/src/runtime.cc#oldcode7713
src/runtime.cc:7713: function->shared()->code()->set_profiler_ticks(0);
On 2013/03/05 14:11:55, Jakob wrote:
> Where did this line go?

Good point, accidentally deleted. Runtime_ParallelRecompile also needs this.

[Jakob Kummerow, 2013-03-05 16:20:50]

LGTM.

On 2013/03/05 15:57:50, Yang wrote:
> Good point, accidentally deleted. Runtime_ParallelRecompile also needs this.

As discussed offline, we'll probably have to handle parallel recompilation vs.
OSR quite differently, but it's OK to land this as it is for now.

[Yang, 2013-03-05 16:22:17]

Committed patchset #2 manually as r13827 (presubmit successful).