Matt Arsenault 700bba297b R600: Implement isTruncateFree
Truncation is just accessing a subregister for any multiple of
the register size, so it's free.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201107 91177308-0d34-0410-b5e6-96231b3b80d8
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