[clang] [clang-repl] fix segfault in CleanUpPTU() (PR #75629)

[Vassil Vassilev via cfe-commits]

================
@@ -373,7 +373,15 @@ std::unique_ptr<llvm::Module> 
IncrementalParser::GenModule() {
 
 void IncrementalParser::CleanUpPTU(PartialTranslationUnit &PTU) {
   TranslationUnitDecl *MostRecentTU = PTU.TUPart;
+  if (!MostRecentTU) {
+    return;
+  }
----------------
vgvassilev wrote:

```suggestion
  if (!MostRecentTU)
    return;
```

https://github.com/llvm/llvm-project/pull/75629
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