[clang] [clang-repl] Names declared in if conditions and for-init statements are local to the inner context (C++ 3.3.2p4) (PR #84150)

[Stefan Gränitz via cfe-commits]

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@@ -5676,24 +5676,32 @@ Parser::DeclGroupPtrTy Parser::ParseTopLevelStmtDecl() {
   // Parse a top-level-stmt.
   Parser::StmtVector Stmts;
   ParsedStmtContext SubStmtCtx = ParsedStmtContext();
-  Actions.PushFunctionScope();
+  ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
----------------
weliveindetail wrote:

I tested without it the `ParseScope` and got a segfault, so I assume we can not 
drop it (without looking into the details). I kept both, `FnScope` and 
`CompoundStmtScope`, because in `ActOnStartTopLevelStmtDecl()` we push them on 
the Sema side as well.

https://github.com/llvm/llvm-project/pull/84150
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