[compiler-rt] [asan] Use InternalMmapVector for error_message_buffer, reallocate wh… (PR #77488)

[via llvm-commits]

Enna1 wrote:

Not sure if InternalScopedString is more appropriate for error_message_buffer,
I did a grep, not found any usage of InternalScopedString as a global variable...

https://github.com/llvm/llvm-project/pull/77488