[clang] [analyzer][CTU] Macro expansions for imported translation units (PR #176126)

[Donát Nagy via cfe-commits]

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@@ -227,7 +229,25 @@ class CrossTranslationUnitContext {
   ASTContext &Context;
   std::shared_ptr<ASTImporterSharedState> ImporterSharedSt;
 
-  using LoadResultTy = llvm::Expected<std::unique_ptr<ASTUnit>>;
+  /// Map of imported FileID's (in "To" context) to FileID in "From" context
+  /// and the ASTUnit for the From context.
+  /// This map is used by getMacroExpansionContextForSourceLocation to lookup a
+  /// FileID and its Preprocessor when knowing only the FileID in the 'To'
+  /// context. The FileID could be imported by any of multiple 'From'
+  /// ASTImporter objects. we do not want to loop over all ASTImporter's to find
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NagyDonat wrote:

```suggestion
  /// ASTImporter objects. We do not want to loop over all ASTImporter's to find
```
Just a typo.

https://github.com/llvm/llvm-project/pull/176126