x86: Emit label only for __mcount_loc section

x86: Emit label only for __mcount_loc section

commit ecc81e33123d7ac9c11742161e128858d844b99d
Author: Andi Kleen <ak@linux.intel.com>
Date:   Fri Sep 26 04:06:40 2014 +0000

    Add direct support for Linux kernel __fentry__ patching

emitted a label, 1, for __mcount_loc section:

1:	call	mcount
	.section __mcount_loc, "a",@progbits
	.quad 1b
	.previous

If __mcount_loc wasn't used, we got an unused label.  Update
x86_function_profiler to emit label only when __mcount_loc section
is used.

gcc/

	PR target/120936
	* config/i386/i386.cc (x86_print_call_or_nop): Add a label
	argument and use it to print label.
	(x86_function_profiler): Emit label only when __mcount_loc
	section is used.

gcc/testsuite/

	PR target/120936
	* gcc.target/i386/pr120936-1.c: New test
	* gcc.target/i386/pr120936-2.c: Likewise.
	* gcc.target/i386/pr120936-3.c: Likewise.
	* gcc.target/i386/pr120936-4.c: Likewise.
	* gcc.target/i386/pr120936-5.c: Likewise.
	* gcc.target/i386/pr120936-6.c: Likewise.
	* gcc.target/i386/pr120936-7.c: Likewise.
	* gcc.target/i386/pr120936-8.c: Likewise.
	* gcc.target/i386/pr120936-9.c: Likewise.
	* gcc.target/i386/pr120936-10.c: Likewise.
	* gcc.target/i386/pr120936-11.c: Likewise.
	* gcc.target/i386/pr120936-12.c: Likewise.
	* gcc.target/i386/pr93492-3.c: Updated.
	* gcc.target/i386/pr93492-5.c: Likewise.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>