[clang] [compiler-rt] [compiler-rt][rtsan] Introduce rtsan_interface.h and ScopedDisabler (PR #106736)

[Chris Apple via cfe-commits]

cjappl wrote:

Just saw the test failure, but it is unrelated:

```
_bk;t=1725300551284FAIL: lld :: ELF/avr-reloc.s (84796 of 87084)

_bk;t=1725300551284******************** TEST 'lld :: ELF/avr-reloc.s' FAILED ********************
```

https://github.com/llvm/llvm-project/pull/106736