[PATCH] [MIScheduler] Slightly better handling of constrainLocalCopy when both source and dest are local

[Michael Kuperstein]

Hi atrick, qcolombet,

This fixes PR21792 by handling an additional case in constrainLocalCopy.

This should probably be generalized, but I don't understand the code well enough to figure out how, yet.
Any suggestions on how to improve this are welcome.

http://reviews.llvm.org/D6823

Files:
  lib/CodeGen/MachineScheduler.cpp
  test/CodeGen/X86/pr21972.ll
  test/CodeGen/X86/vector-idiv.ll

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