Andrew McCreight 2d929a5569 Bug 1158558, part 2 - Finish incremental GCs in progress in BeginCollection() and ShutdownCollect(). r=smaug
Various parts of the first half of BeginCollection() can start an incremental GC.
This is bad because running the GC and CC at the same time can cause the CC to end
up with pointers to dead JS objects.

To avoid this, we finish any incremental GC in progress in BeginCollection. This
is slow, but hopefully it is rare.
2015-05-15 10:33:09 -07:00
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