[clang] Fix the behavior of __COUNT__ macros when PCH is enabled (PR #105591)

[Giuliano Belinassi via cfe-commits]

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@@ -1243,12 +1247,19 @@ bool ASTUnit::Parse(std::shared_ptr<PCHContainerOperations> PCHContainerOps,
   }
 
   std::unique_ptr<TopLevelDeclTrackerAction> Act(
-      new TopLevelDeclTrackerAction(*this));
+      new TopLevelDeclTrackerAction(*this, true));
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giulianobelinassi wrote:

The problem is that when you are using PCH it always recreate the preprocessor for compiling the .c/.cpp file instead of reusing the one that resulted from the PCH.  So we need a way to ensure that it isn't recreated in this process.

https://github.com/llvm/llvm-project/pull/105591