Evan Cheng efdcb839f2 - Added regsOverlap() to test if two registers overlap. Or in case they are
virtual registers, test if they the same.
- Added a virtual method to return target specific reserved registers, e.g. SP.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34375 91177308-0d34-0410-b5e6-96231b3b80d8
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