[ms-inline asm] Add support for using the LENGTH, TYPE, and SIZE operators with
variables that use namespace alias qualifiers.  Test case coming on clang side
shortly.
Part of rdar://13499009


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179343 91177308-0d34-0410-b5e6-96231b3b80d8