Update FileCheck prefixes in preparation for the addition of Mips64 MSA tests.

No functional changes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200541 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][msa] Add insert.d instruction.

This instruction is only available on Mips64 cores that implement the MSA ASE.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200543 91177308-0d34-0410-b5e6-96231b3b80d8