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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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130799 91177308-0d34-0410-b5e6-96231b3b80d8