[MSP430] Add missing instruction forms

* Add missing mm, [r|m]n, [r|m]p instruction forms.
* Fix bit16mc instruction.

Patch by Kristina Bessonova!

Differential Revision: https://reviews.llvm.org/D56546


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350902 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed