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

[via llvm-commits]

davidtrevelyan wrote:

Tagging interested parties: @vitalybuka @cjappl @chapuni - many thanks in advance for any reviews.

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