[LLDB][LoongArch] Delete the s9 register alias definition

[LLDB][LoongArch] Delete the s9 register alias definition

In RegisterInfos_loongarch64.h, r22 is defined twice. Having an extra array
member causes problems reading and writing registers defined after r22. So,
for r22, keep the alias fp, delete the s9 alias.

The PC register is incorrectly accessed when the step command is executed.
The step command behavior is incorrect.

This test reflects this problem:

```
loongson@linux:~$ cat test.c

 #include <stdio.h>

int func(int a) {
  return a + 1;
}

int main(int argc, char const *argv[]) {
  func(10);
  return 0;
}

loongson@linux:~$ clang -g test.c  -o test

```

Without this patch:
```
loongson@linux:~$ llvm-project/llvm/build/bin/lldb test
(lldb) target create "test"
Current executable set to '/home/loongson/test' (loongarch64).
(lldb) b main
Breakpoint 1: where = test`main + 40 at test.c:8:3, address = 0x0000000120000668
(lldb) r
Process 278049 launched: '/home/loongson/test' (loongarch64)
Process 278049 stopped
* thread #1, name = 'test', stop reason = breakpoint 1.1
    frame #0: 0x0000000120000668 test`main(argc=1, argv=0x00007fffffff72a8) at test.c:8:3
   5   	}
   6
   7   	int main(int argc, char const *argv[]) {
-> 8   	  func(10);
   9   	  return 0;
   10  	}
   11
(lldb) s
Process 278049 stopped
* thread #1, name = 'test', stop reason = step in
    frame #0: 0x0000000120000670 test`main(argc=1, argv=0x00007fffffff72a8) at test.c:9:3
   6
   7   	int main(int argc, char const *argv[]) {
   8   	  func(10);
-> 9   	  return 0;
   10  	}

```

With this patch:

```
loongson@linux:~$ llvm-project/llvm/build/bin/lldb test
(lldb) target create "test"
Current executable set to '/home/loongson/test' (loongarch64).
(lldb) b main
Breakpoint 1: where = test`main + 40 at test.c:8:3, address = 0x0000000120000668
(lldb) r
Process 278632 launched: '/home/loongson/test' (loongarch64)
Process 278632 stopped
* thread #1, name = 'test', stop reason = breakpoint 1.1
    frame #0: 0x0000000120000668 test`main(argc=1, argv=0x00007fffffff72a8) at test.c:8:3
   5   	}
   6
   7   	int main(int argc, char const *argv[]) {
-> 8   	  func(10);
   9   	  return 0;
   10  	}
   11
(lldb) s
Process 278632 stopped
* thread #1, name = 'test', stop reason = step in
    frame #0: 0x0000000120000624 test`func(a=10) at test.c:4:10
   1   	 #include <stdio.h>
   2
   3   	int func(int a) {
-> 4   	  return a + 1;
   5   	}

```

Reviewed By: SixWeining, DavidSpickett

Differential Revision: https://reviews.llvm.org/D140615