PR50294: Fix a performance regression from 2c9dbcd.

Per the contract of ReadLateParsedTemplates, we should not be returning
the same results multiple times. No functionality change intended, other
than to runtime.

Thanks to Luboš Luňák for identifying the cause of the regression!

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 128350c..dfa7d55 100644 (file)
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -8412,6 +8412,8 @@ void ASTReader::ReadLateParsedTemplates(
       LPTMap.insert(std::make_pair(FD, std::move(LT)));
     }
   }
+
+  LateParsedTemplates.clear();
 }
 
 void ASTReader::LoadSelector(Selector Sel) {