David Majnemer e6bb895ab5 [LICM] Make sinkRegion and hoistRegion non-recursive ...

Large CFGs can cause us to blow up the stack because we would have a
recursive step for each basic block in a region.

Instead, create a worklist and iterate it. This limits the stack usage
to something more manageable.

Differential Revision: https://reviews.llvm.org/D35609

llvm-svn: 308582

2017-07-20 03:27:02 +00:00

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