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Commit 732ad80d authored by Andrew Trick's avatar Andrew Trick
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LSR: Don't optimize loops if an outer loop has no preheader. 

LoopSimplify may not run on some outer loops, e.g. because of indirect
branches. SCEVExpander simply cannot handle outer loops with no preheaders.
Fixes rdar://10655343 SCEVExpander segfault.

llvm-svn: 147718
parent 07082096
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