[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]

weliveindetail wrote:

This fixes https://github.com/llvm/llvm-project/issues/83028 which provides context on investigation.

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