Jan Svoboda e6830b6028 [clang][modules] NFCI: Extract optionality out of Module::{Header,DirectoryName} ...

Most users of `Module::Header` already assume its `Entry` is populated. Enforce this assumption in the type system and handle the only case where this is not the case by wrapping the whole struct in `std::optional`. Do the same for `Module::DirectoryName`.

Depends on D151584.

Reviewed By: benlangmuir

Differential Revision: https://reviews.llvm.org/D151586

2023-05-30 21:06:51 -07:00

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