[mips] Make FileCheck prefixes match the CPU they check
[mips] Make FileCheck prefixes match the CPU they check

Summary:
For example: s/MIPS32-EB-AS/MIPS32R2-EB-AS/ since it is for MIPS32r2 not MIPS32.

This reduces the noise in my next Clang patch.

Differential Revision: http://reviews.llvm.org/D4271


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@212177 91177308-0d34-0410-b5e6-96231b3b80d8

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