[Explicit Module Builds] Remove dead/incorrect code for handling header inputs of binary module dependencies #1653
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As of swiftlang/swift#72067, we instead serialize
.h
inputs directly into binary.swiftmodule
files, because their clients may not be able to use the dependnecies' corresponding.pch
files due to a compilation context mismatch. The clients of such binary modules then consume the serialized.h
files directly, and compile them, implicitly, using explicit module dependencies collected during scan of such header files.Resolves rdar://131261765