71a91c1194
`DlSymAllocator` allows early allocations, when tsan is not yet initialized, e.g. from `dlsym`. All other sanitizers with interceptors already use `DlSymAllocator`. Existing `in_symbolizer()` tsan logic is very similar. However, we need to keep both as `DlSymAllocator` does not support large allocations, needed for Symolizer.