[mips] Make simm6 consistent with the rest. NFC.

Summary:

Reviewers: vkalintiris

Subscribers: dsanders, llvm-commits

Differential Revision: http://reviews.llvm.org/D18147


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264057 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed