[llvm-bugs] [Bug 97673] [assemble] clang doesn't accept the operand %1

[LLVM Bugs via llvm-bugs]

Issue	97673
Summary	[assemble] clang doesn't accept the operand %1
Labels	clang
Assignees
Reporter	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

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

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