[Patch, AArch64] Adjust gcc.dg/torture/stackalign/builtin-apply-2.c

[Yufeng Zhang]

Hi,

This patch sets STACK_ARGUMENTS_SIZE with 0 for AArch64 as variadic 
arguments to 'bar' are passed in registers on this target.

OK for the trunk?

Thanks,
Yufeng

gcc/testsuite/

	* gcc.dg/torture/stackalign/builtin-apply-2.c: set
	STACK_ARGUMENTS_SIZE with 0 if __aarch64__ is defined.
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