[AsmParser] Add a function to parse a standalone type.

This is useful for MIR serialization. Indeed generic machine instructions
must have a type and we don't want to duplicate the logic in the MIParser.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262868 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed