[MSP430] Minor fixes/improvements for assembler/disassembler

* Teach AsmParser to recognize @rn in distination operand as 0(rn).
* Do not allow Disassembler decoding instructions that have size more
  than a number of input bytes.
* Fix UB in MSP430MCCodeEmitter.

Patch by Kristina Bessonova!

Differential Revision: https://reviews.llvm.org/D56547


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350903 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed