[clang] [clang-repl] Extend the C support. (PR #89804)

[Aaron Ballman via cfe-commits]

================
@@ -407,6 +406,16 @@ void IncrementalParser::CleanUpPTU(PartialTranslationUnit 
&PTU) {
       }
     }
   }
+
+  // FIXME: We should de-allocate MostRecentTU
+  for (Decl *D : MostRecentTU->decls()) {
+    auto *ND = dyn_cast<NamedDecl>(D);
+    if (!ND)
+      continue;
+    // Check if we need to clean up the IdResolver chain.
+    if (ND->getDeclName().getFETokenInfo())
----------------
AaronBallman wrote:

As a one-liner rather than a four-liner.
```
if (auto *ND = dyn_cast<NamedDecl>(D);
    ND && ND->getDeclName().getFETokenInfo())
```

https://github.com/llvm/llvm-project/pull/89804
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