[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:

Also, neither of the main authors of this patch have review access. If someone sees this after it has an acceptable number of approvals and wants to merge it, that would be great! Thanks

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