Factor out OSR-related graph-building functionality from hydrogen.cc.

Factor out OSR-related graph-building functionality from hydrogen.cc.

BUG=

Committed: https://code.google.com/p/v8/source/detail?r=15488

[titzer, 2013-07-02 08:55:44]

This is a refactoring CL that moves OSR-related hydrogen stuff out of the main
hydrogen.cc file and provides a place for collecting the data needed during OSR
compilations.

[Michael Starzinger, 2013-07-03 10:54:12]

LGTM with one comment.

https://codereview.chromium.org/18496002/diff/1/src/hydrogen.h
File src/hydrogen.h (right):

https://codereview.chromium.org/18496002/diff/1/src/hydrogen.h#newcode1423
src/hydrogen.h:1423: class HOsrBuilder {
Since the implementation has been factored out into a separate file, can we also
move this declaration into a hydrogen-osr.h file?

[titzer, 2013-07-04 08:53:36]

On 2013/07/03 10:54:12, Michael Starzinger wrote:
> LGTM with one comment.
> 
> https://codereview.chromium.org/18496002/diff/1/src/hydrogen.h
> File src/hydrogen.h (right):
> 
> https://codereview.chromium.org/18496002/diff/1/src/hydrogen.h#newcode1423
> src/hydrogen.h:1423: class HOsrBuilder {
> Since the implementation has been factored out into a separate file, can we
also
> move this declaration into a hydrogen-osr.h file?

Done.

[titzer, 2013-07-04 09:20:15]

Committed patchset #2 manually as r15488 (presubmit successful).