[Bug target/53929] [meta-bug] -masm=intel with global symbol

["jbeulich at suse dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53929

--- Comment #14 from jbeulich at suse dot com ---
(In reply to LIU Hao from comment #13)
> MSVC outputs:
> ```
> get_value PROC                                      ; COMDAT
>         mov     ecx, DWORD PTR eax
>         mov     rax, QWORD PTR rip
>         mov     eax, DWORD PTR [rax+rcx*4]
>         ret     0
> get_value ENDP
> ```

Which as least MASM up to 12.x won't assemble. For one it complains about "rip"
being undeclared. And then the load of "ecx" is _not_ a memory access (i.e. the
"DWORD PTR" is ignored there). Which is in line with it also objecting to
something like "extrn eax:dword".

I say this because I'd be happy to help this on the gas side, but only without
breaking MASM compatibility. My present plan for gas is (as already outlined in
#11) to make quoted identifiers unambiguously mean symbols, not registers. But
of course that would still require a gcc side change as well. Unfortunately
there continue to be inconsistencies in gas with quoted identifiers in general,
and it's not entirely clear yet whether those may need addressing first.