[clang] [clang][modules] Adopt `FileEntryRef` in the `HeaderFileInfo` block in PCM files (PR #67383)

[Ben Langmuir via cfe-commits]

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@@ -612,24 +612,21 @@ FileManager::getNoncachedStatValue(StringRef Path,
 }
 
 void FileManager::GetUniqueIDMapping(
-    SmallVectorImpl<const FileEntry *> &UIDToFiles) const {
+    SmallVectorImpl<OptionalFileEntryRef> &UIDToFiles) const {
   UIDToFiles.clear();
   UIDToFiles.resize(NextFileUID);
 
-  // Map file entries
-  for (llvm::StringMap<llvm::ErrorOr<FileEntryRef::MapValue>,
-                       llvm::BumpPtrAllocator>::const_iterator
-           FE = SeenFileEntries.begin(),
-           FEEnd = SeenFileEntries.end();
-       FE != FEEnd; ++FE)
-    if (llvm::ErrorOr<FileEntryRef::MapValue> Entry = FE->getValue()) {
-      if (const auto *FE = Entry->V.dyn_cast<FileEntry *>())
-        UIDToFiles[FE->getUID()] = FE;
-    }
-
-  // Map virtual file entries
-  for (const auto &VFE : VirtualFileEntries)
-    UIDToFiles[VFE->getUID()] = VFE;
+  for (const auto &Entry : SeenFileEntries) {
+    // Only return existing non-virtual files.
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benlangmuir wrote:

"virtual" is an overloaded term here; maybe "VFS-mapped"?

https://github.com/llvm/llvm-project/pull/67383