Don't attach annotations to MCInst's. Instead, have the disassembler return, and...

Don't attach annotations to MCInst's.  Instead, have the disassembler return, and the printer accept, an annotation string which can be passed through if the client cares about annotations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139876 91177308-0d34-0410-b5e6-96231b3b80d8