[CIR] Implement flattening for cleanup scopes with multiple exits (#180627) This implements CFG flattening for cir.cleanup.scope operations where the scope body has multiple exits that must all branch through the cleanup region. This uses the same strategy that Clang uses when generating LLVM IR for equivalent cases -- a cleanup destination slot is allocated on the stack, and a value is stored to this slot before each branch to the cleanup, indicating where control must go after the cleanup is executed. Substantial amounts of this PR were created using agentic AI tools, but I have carefully reviewed the code, comments, and tests and made changes as needed.
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