Walter Lee f75e803679 [RegAllocGreedy] Fix crash in tryLocalSplit ...

tryLocalSplit only handles a single use block, but an interval may
have multiple use blocks.  So don't crash in that case.  This fixes
PR38795.

Differential revision: https://reviews.llvm.org/D52277

llvm-svn: 342682

2018-09-20 20:05:57 +00:00

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