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

[Vassil Vassilev via llvm-commits]

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@@ -242,6 +249,34 @@ class BumpPtrAllocatorImpl
 
   size_t GetNumSlabs() const { return Slabs.size() + CustomSizedSlabs.size(); }
 
+  SlabCheckPoint CheckPoint() const {
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vgvassilev wrote:

Can we have an llvm-specific test case for this? This way we can put it as a separate PR. Probably `CheckPoint` needs a better name. I believe this is a more generic and useful interface hiding under this implementation.

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