[TableGen][AsmMatcherEmitter] Allow tied operands of different classes in aliases.
Allow a tied operand of a different operand class in InstAliases,
so that the operand can be printed (and added to the MC instruction)
as the appropriate register. For example, 'GPR64as32', which would
be printed/parsed as a 32bit register and should match a tied 64bit
register operand, where the former is a sub-register of the latter.
This patch also generalizes the constraint checking to an overrideable
method in MCTargetAsmParser, so that target asmparsers can specify
whether a given operand satisfies the tied register constraint.
Reviewers: olista01, rengolin, fhahn, SjoerdMeijer, samparker, dsanders, craig.topper
Reviewed By: fhahn
Differential Revision: https://reviews.llvm.org/D47714