mingw: Ensure symbols are quoted in Intel syntax

mingw: Ensure symbols are quoted in Intel syntax

Previously, this code

   extern int shl;
   int get_shl(void) { return shl; }

gave errors like

   $ x86_64-w64-mingw32-gcc -masm=intel test.c
   ccUSyr0f.s: Assembler messages:
   ccUSyr0f.s:24: Error: invalid use of operator "shl"

because it contained

   .refptr.shl:
       .quad   shl

This `shl` should have referenced the symbol, but it appeared in an expression
context, where, in Intel syntax, it got interpreted as the shift-left operator.

This commit fixes the issue by emitting the target symbol with
`ASM_OUTPUT_LABELREF`, which will quote it properly with regard to the output
assembler syntax.

	PR target/53929

gcc/ChangeLog:

	* config/mingw/winnt.cc (mingw_pe_file_end): Use `ASM_OUTPUT_LABELREF`
	to emit `name`.

Signed-off-by: LIU Hao <lh_mouse@126.com>
Signed-off-by: Jonathan Yong <10walls@gmail.com>