commit 44fb469728d0dab7eaf18bad3f0347d605563d19
author Youling Tang <tangyouling@loongson.cn> Tue Nov 01 20:48:45 2022 +0800
committer Copybara-Service <copybara-worker@google.com> Tue Nov 01 05:51:00 2022 -0700
tree 26e1c81d73e10335be212f04a4988fac357b6ce5
parent a80b668abf7145f1678768436e09b27dc6d54b9b

[sanitizer] Fix build error with current LoongArch Clang

Fix the following build failures:
```
In file included from /home/loongson/llvm-work/llvm-project/compiler-rt/lib/sanitizer_common/sanit>
llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_syscall_linux_loongarch64.inc:27:23: error>
  register u64 a7 asm("a7") = nr;
                      ^
llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_syscall_linux_loongarch64.inc:28:23: error>
  register u64 a0 asm("a0");                      ^
```

The non-prefix `$` syntax in inline assembly is not supported in clang
yet (it is supported by gcc), add prefix `$` to solve the problem.

Differential Revision: https://reviews.llvm.org/D137145

GitOrigin-RevId: cb84df210a477c1038b659c9de5d1a01fdb85b92