[Runtime] Add a NULL check to MetadataAllocator. #40139
Merged
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MetadataAllocator should never return NULL, but bugs or corruption could potentially make that happen. On the large path, switch from malloc to swift_slowAlloc, which aborts on failure. On the pool path, check for a NULL allocation pointer, and log a bunch of information about the allocation request and the allocator's current state.
rdar://84503396