[clang] [llvm] [Clang-Repl] Introduce Error Recovery for Clang-Repl. (PR #223305)

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@@ -620,6 +620,11 @@ template <class T, class VectorT = SmallVector<T *, 8>> class FoldingSetVector {
     Vector.push_back(N);
   }
 
+  void pop_back() {
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SahilPatidar wrote:

Yes, we need to remove specialization from FoldingSetVector.

https://github.com/llvm/llvm-project/pull/223305