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Commit 38c4e34a authored by Andrew Trick's avatar Andrew Trick
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indvars: Added canExpandBackEdgeTakenCount. 

Only create a canonical IV for backedge taken count if it will
actually be used by LinearFunctionTestReplace. And some related
cleanup, preparing to reduce dependence on canonical IVs.
No significant effect on x86 or arm in the test-suite.

llvm-svn: 130799
parent 0934268e
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