PR #4582 Metadata cache optimizations

Metadata cache optimizations #4582

swift-ci merged 3 commits into swiftlang:master from rjmccall:metadata-caching-redux

Type metadata for a class isn't necessarily ClassMetadata; it could

e958dd06

Remove the linked list through metadata caches, since LLDB is

99c52e89

Simplify and optimize the structural type metadata caches to use Conc…

17d72f55

swift-ci merged 65f6d9dd into master 9 years ago

rjmccall deleted the metadata-caching-redux branch 9 years ago

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