Fix the swift-inspect dump-generic-metadata operation. #66524
Merged
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ReflectionContext::allocationMetadataPointer() was reading the metadata pointer from a wrong offset because of the out-of-sync struct layouts and dump-generic-metadata was not working correctly.
This change resync's the layouts and adds a static_assert to verify that the offsets match between GenericMetadataCacheEntry and GenericCacheEntry.