Nate Begeman 8531f6f42a Generate fewer reg-reg copies for the register allocator to deal with.
This eliminates over 2000 in hbd alone.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17973 91177308-0d34-0410-b5e6-96231b3b80d8
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