[compiler-rt] [compiler-rt][rtsan] Use sanitizer internal allocator during rtsan init to avoid segfault in dlsym (PR #98679)

[Chris Apple via llvm-commits]

cjappl wrote:

Having an error on android, which I thought was previously removed but may have been caught in a revert conflict.

```
OSError: [Errno 8] Exec format error: '/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/compiler_rt_build_android_aarch64/lib/rtsan/tests/./Rtsan-aarch64-NoInstTest'
```

https://github.com/llvm/llvm-project/pull/99964

https://github.com/llvm/llvm-project/pull/98679