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

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Haojian Wu (hokein)

<details>
<summary>Changes</summary>



The incremental processing mode doesn't seem to work well for C++.

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


1 Files Affected:

- (modified) clang/lib/Sema/SemaDecl.cpp (+2-1) 


``````````diff
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index a6734ef8c30aa..4b9b735f1cfb4 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2288,7 +2288,8 @@ void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
     // Partial translation units that are created in incremental processing must
     // not clean up the IdResolver because PTUs should take into account the
     // declarations that came from previous PTUs.
-    if (!PP.isIncrementalProcessingEnabled() || getLangOpts().ObjC)
+    if (!PP.isIncrementalProcessingEnabled() || getLangOpts().ObjC ||
+        getLangOpts().CPlusPlus)
       IdResolver.RemoveDecl(D);
 
     // Warn on it if we are shadowing a declaration.

``````````

</details>


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