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

[NAKAMURA Takumi via llvm-commits]

https://github.com/chapuni approved this pull request.

This works for me.
Please wait for other reviews.

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