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513f5fb17a
We scan the target's initial allocation pool, and all 16kB heap allocations. We check each pointer-aligned offset within those areas, and try to read it as Swift metadata and get a name from it. If that fails, quietly move on. It's very unlikely for some random memory to look enough like Swift metadata for this to produce a name, so this works very well to print the generic metadata instantiated in the remote process without requiring `SWIFT_DEBUG_ENABLE_METADATA_ALLOCATION_ITERATION`. rdar://161120936