[clang] [llvm] Alisonz/tmp1 (PR #205163)

[Alison Zhang via cfe-commits]

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@@ -840,6 +847,15 @@ class SourceManager : public RefCountedBase<SourceManager> {
   /// we can add a cc1-level option to do so.
   SmallVector<std::pair<std::string, FullSourceLoc>, 2> StoredModuleBuildStack;
 
+  /// Cache of all text encoding converters used by this SourceManager.
+  /// This includes both the input charset converter and file tag converters.
+  /// Maps from "source_encoding:target_encoding" to the converter.
+  llvm::StringMap<std::unique_ptr<llvm::TextEncodingConverter>> ConverterCache;
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azhan92 wrote:

Only use SourceEncoding as a key

https://github.com/llvm/llvm-project/pull/205163