[PATCH] D90481: Basic: Change Module::Umbrella to a PointerUnion, NFC

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.
dexonsmith added reviewers: arphaman, JDevlieghere.
Herald added a subscriber: ributzka.
dexonsmith requested review of this revision.

Change `Module::Umbrella` from a `const void *` to a `PointerUnion` of
`FileEntry` and `DirectoryEntry`. We can drop the `HasUmbrellaDir` bit
(since `PointerUnion` includes that).

This change makes it safer to update to `FileEntryRef` and
`DirectoryEntryRef` in a future patch.


https://reviews.llvm.org/D90481

Files:
  clang/include/clang/Basic/Module.h
  clang/lib/Basic/Module.cpp
  clang/lib/Lex/ModuleMap.cpp

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