Extract StackFrameIteratorBase

Extract StackFrameIteratorBase

This change introduces StackFrameIteratorBase which owns singleton frame instances and encapsulates some basic iterator functionality. It has two actual implementations: StackFrameIterator and SafeStackFrameIterator.

All logic specific to frame iteration at a random point (basically checks that fp and sp extracted from stack frames are within current stack boundaries) used only by CPU profiler is now concentrated in SafeStackFrameIterator.

Generic stack iteration used in all other places is put into StackFrameIterator. Also this iterator unlike SafeStackFrameIterator iterates through stack handlers.

StackAddressValidator and ExitFrameValidator classes were removed in favor of inline checks and simple methods.

BUG=None
R=loislo@chromium.org, svenpanne@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=15349

[loislo, 2013-06-26 12:34:11]

lgtm

[Sven Panne, 2013-06-27 09:29:06]

lgtm

[yurys, 2013-06-27 09:34:40]

Committed patchset #4 manually as r15349 (presubmit successful).