Merging r238146:

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r238146 | thomas.stellard | 2015-05-25 12:15:50 -0400 (Mon, 25 May 2015) | 6 lines

R600/SI: Use NAME rather than opName as the key to the MCOpcode tables

This lets us drop a parameter the opName parameter to the VINTRP
multiclass and makes it possible to create multiple VINTRP defs
with the same asm mnemonic.

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llvm-svn: 240284