James Molloy d5073858ac [DependenceAnalysis] Fix for PR21585: collectUpperBound triggers asserts
collectUpperBound hits an assertion when the back edge count is wider then the desired type.

If that happens, truncate the backedge count.

Patch by Philip Pfaffe!

llvm-svn: 237439
2015-05-15 12:17:22 +00:00
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