Old space cannot be assumed to be iterable between GCs, even if swept precisely.

Old space cannot be assumed to be iterable between GCs, even if swept precisely.

This is because allocation folding can cause uninitialized and hence uniterable fragments. Trying to inspect them causes SizeFromMap() crashes.

R=hpayer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23084

[Jakob Kummerow, 2014-08-12 15:15:26]

Thanks for your help tracking this one down!

[Hannes Payer (out of office), 2014-08-12 15:16:10]

lgtm

[Jakob Kummerow, 2014-08-12 15:29:10]

Committed patchset #1 manually as 23084 (presubmit successful).