Use __USER_LABEL_PREFIX__ in asm statement

Use __USER_LABEL_PREFIX__ in asm statement

A target may have a prefix in function symbol.  Update interrrupt tests
to use __USER_LABEL_PREFIX__ for function symbol in asm statement.

	* gcc.dg/guality/pr68037-1.c (ASMNAME): New.
	(ASMNAME2): Likewise.
	(main): Replace fn in asm statement with ASMNAME ("fn").
	* gcc.dg/guality/pr68037-2.c: Likewise.
	* gcc.dg/guality/pr68037-3.c: Likewise.
	* gcc.dg/torture/pr68037-1.c: Likewise.
	* gcc.dg/torture/pr68037-2.c: Likewise.
	* gcc.dg/torture/pr68037-3.c: Likewise.

From-SVN: r237304