s390/maccess: use register pair instead of register asm

static int __no_sanitize_address __memcpy_real(void *dest, void *src, size_t count)

{

	register unsigned long _dest asm("2") = (unsigned long) dest;

	register unsigned long _len1 asm("3") = (unsigned long) count;

	register unsigned long _src  asm("4") = (unsigned long) src;

	register unsigned long _len2 asm("5") = (unsigned long) count;

	union register_pair _dst, _src;

	int rc = -EFAULT;

	_dst.even = (unsigned long) dest;

	_dst.odd  = (unsigned long) count;

	_src.even = (unsigned long) src;

	_src.odd  = (unsigned long) count;

	asm volatile (

		"0:	mvcle	%1,%2,0x0\n"

		"0:	mvcle	%[dst],%[src],0\n"

		"1:	jo	0b\n"

		"	lhi	%0,0x0\n"

		"	lhi	%[rc],0\n"

		"2:\n"

		EX_TABLE(1b,2b)

		: "+d" (rc), "+d" (_dest), "+d" (_src), "+d" (_len1),

		  "+d" (_len2), "=m" (*((long *) dest))

		: "m" (*((long *) src))

		: "cc", "memory");

		: [rc] "+&d" (rc), [dst] "+&d" (_dst.pair), [src] "+&d" (_src.pair)

		: : "cc", "memory");

	return rc;

}