[mips] Add PredicateControl to InstAlias's

Summary:
No functional change

Depends on D3649

Reviewers: vmedic

Reviewed By: vmedic

Differential Revision: http://reviews.llvm.org/D3672

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208334 91177308-0d34-0410-b5e6-96231b3b80d8