[clang] [clang][modules] Minor improvements to diagnosing `out of date` errors (PR #136612)

[Jan Svoboda via cfe-commits]

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@@ -3349,10 +3351,29 @@ ASTReader::ReadControlBlock(ModuleFile &F,
                                       .getModuleCache()
                                       .getInMemoryModuleCache()
                                       .isPCMFinal(F.FileName);
-      if (isDiagnosedResult(Result, Capabilities) || recompilingFinalized)
+      if (isDiagnosedResult(Result, Capabilities) || recompilingFinalized) {
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jansvoboda11 wrote:

Can you clarify why you're conditionalizing this diagnostic on these?

https://github.com/llvm/llvm-project/pull/136612