* Add masking instructions before loads and stores (in MC layer). * Add masking instructions after SP changes (in MC layer). * Forbid loads, stores and SP changes in delay slots (in MI layer). Differential Revision: http://llvm-reviews.chandlerc.com/D2904 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203484 91177308-0d34-0410-b5e6-96231b3b80d8