[pull] swift/main from apple:swift/main#1001

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pull[bot] merged 3 commits intoswiftwasm:swift/mainfrom

swiftlang:swift/main

Dec 19, 2020

Commits on Dec 19, 2020

Implement TypeSystemSwiftTypeRef::GetReferentType()
adrian-prantl
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Merge pull request #2267 from apple/68171397
adrian-prantl
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Merge commit 'ae2e3d9b2b51' from swift/release/5.4 into swift/main
git apple-llvm automerger
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