================
@@ -288,10 +288,12 @@ class ModuleFile {
   /// for the entry is SLocEntryOffsetsBase + SLocEntryOffsets[i].
   uint64_t SLocEntryOffsetsBase = 0;
 
-  /// Offsets for all of the source location entries in the
-  /// AST file.
+  /// Stream bit offsets for all of the source location entries in the AST 
file.
   const uint32_t *SLocEntryOffsets = nullptr;
 
+  /// SLocEntry offsets that have been loaded from the AST file.
+  std::vector<SourceLocation::UIntTy> SLocEntryOffsetLoaded;
----------------
jansvoboda11 wrote:

This ends up being ~10MB for single TU using 37 modules from the Darwin SDK. 
I'm not thrilled about that, what do you think? We could store these offsets in 
`SourceManager::LoadedSLocEntryTable` and mark the fact that the entry has not 
been fully deserialized in a counterpart to `llvm::BitVector SLocEntryLoaded`.

https://github.com/llvm/llvm-project/pull/66966
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