Evan Cheng a3ca3149f2 Add CopyCost to TargetRegisterClass. This specifies the cost of copying a value
between two registers in the specific class.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42123 91177308-0d34-0410-b5e6-96231b3b80d8
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