[llvm-branch-commits] [tsan] Switch to DlSymAllocator (PR #108920)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/108920

Existing `in_symbolizer()` tsan logic does almost
the same.

Not exactly NFC: DlSymAllocator does not allow
large allocation, which probably unlikely here
anyway. Large allocations will go to secondary
allocator, which use slow `PointerIsMine`.