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12f390e9c0
This also implements a two minor improvements:
* Don't insert live-out stores IN the region, insert them on the code path
that exits the region
* If the region is exited to the same block from multiple paths, share the
switch statement entry, live-out store code, and the basic block.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12401 91177308-0d34-0410-b5e6-96231b3b80d8