Change 'while' loop to 'do' loop.

Add a safety measure. It isn't safe to assume in ScalarEvolutionExpander that
all loops are in canonical form (but it should be safe for loops that have
AddRecs).
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52275 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed