[ms-inline asm] Make this a hard error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179865 91177308-0d34-0410-b5e6-96231b3b80d8
[ms-inline asm] Move this variable into the scope in which it is used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179866 91177308-0d34-0410-b5e6-96231b3b80d8
[ms-inline asm] Remove these asserts. C++ variables that use namespace
qualifiers don't necessarily begin with an identifier (e.g., ::foo::bar).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179867 91177308-0d34-0410-b5e6-96231b3b80d8