Change the semantics of OverCommit to allow polling #1382
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This is useful if the VM cannot trigger GC at most of its allocation sites. If allocation over-commits while still triggering GC, the GC thread can pause the mutators at the nearest safepoints.
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Like #1380, but we remove the old OverCommit, and change the semantics of OverCommit to that of RequestAndOverCommit.
By doing this, the OnAllocationFail will no longer prevent polling from happening.