[inline-asm] clang doesn't accept the operand %1

[vfdff]

• test: https://gcc.godbolt.org/z/e1c1qMTTM

void _mcount(uint64_t caller_ra){
	uint64_t rbp=0;
	uint64_t rsp=0;
	__asm__ __volatile__("mov x0, fp\n"
                         "mov %1, sp \n"
                         :"=g"(rbp),"=g"(rsp)       
                         :); 
	
	printf("rbp = 0x%llx , rsp=0x%llx\n" , rbp , rsp);
}

I except the register value sp will be saved in local variable rsp. But it is only accept by gcc

gcc -c -o testhello.o testhello.c -pg -g

• error reported by clang:

<source>:9:27: error: invalid operand for instruction
    9 |                          "mov %1, sp \n"

[svs-quic]

This looks like a duplicate of #20571.
#92040 is an effort to fix this.