Update function type mangling to use Clang type when applicable.#34057

Merged

swift-ci merged 3 commits intoswiftlang:mainfrom

varungandhi-apple:vg-track-isDerivable-update-mangling

Oct 22, 2020

Commits on Oct 7, 2020

[AST] Add method to check if a function type has a non-trivial Clang type.
varungandhi-apple
committed

Commits on Oct 21, 2020

[Mangler] Handle mangling for Clang types not derivable from Swift types.
varungandhi-apple
committed
[ASTPrinter] Print Clang type only if not derivable from Swift type.
varungandhi-apple
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