[LoongArch] Add debug location for register reload

Although the automatically inserted reload instruction in the `Epilogue`
is unrelated to the original code, in order to improve debugger
functionality, we have re-added debugging location information in the
reload instruction. When using an empty debugging location, the
following issue occurs:
```
loongson@linux:~$ cat -n test.c
 1  int printf(const char *, ...);
 2  int main(int argc, char **argv) {
 3    printf("%d\n", argc);
 4    return 0;
 5  }
 clang -g -O0 test.c -o test
```
Without this patch, the debugger is unable to correctly access the
current stack information when a breakpoint is set on line 4:

```
loongson@linux:~$ gdb -q ./test
Reading symbols from ./test...
(gdb) break 4
Breakpoint 1 at 0x7c0: file test.c, line 4.
(gdb) run
Starting program: /home/wanglei/test
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/loongarch64-linux-gnu/libthread_db.so.1".
1

Breakpoint 1, main (argc=<error reading variable: Cannot access memory at address 0xffffffffffffffe8>,
    argv=<error reading variable: Cannot access memory at address 0xffffffffffffffe0>) at test.c:4
4         return 0;
```

Reviewed By: heiher, xen0n

Pull Request: https://github.com/llvm/llvm-project/pull/122057

0 files changed, 0 insertions, 0 deletions