[clang] Fix clang reject valid C++ code after d999ce0302f06d250f6d496b56a5a5f (PR #94471)

[Vassil Vassilev via cfe-commits]

================
@@ -413,7 +413,9 @@ void IncrementalParser::CleanUpPTU(PartialTranslationUnit 
&PTU) {
     if (!ND)
       continue;
     // Check if we need to clean up the IdResolver chain.
-    if (ND->getDeclName().getFETokenInfo())
+    if (ND->getDeclName().getFETokenInfo() &&
+        CI->getPreprocessor().isIncrementalProcessingEnabled() &&
----------------
vgvassilev wrote:

Here the incremental processing is guaranteed. We do not need to check.

https://github.com/llvm/llvm-project/pull/94471
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