Andrew Trick 029f4fd2ff pre-RA-sched fix: only reevaluate physreg interferences when necessary.
Fixes rdar:13279013: scheduler was blowing up on select instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176037 91177308-0d34-0410-b5e6-96231b3b80d8
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