[ms-inline asm] Hoist more common code into the AsmStmt base class.  Add stubs
with FIXMEs for unimplemented features.  No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162716 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed