[CIR] Add support for normal cleanups (#149948) This change adds basic handling for normal cleanups. This is a very minimal implemention. In particular, it uses a naive substitute for the rich cleanup and EH stack handling that is present in classic codegen and the CIR incubator. This is intended as a temporary implementation to allow incremental progress. It is not expected to scale well enough to be used in a production environment. It will be replaced with the full EHScopeStack handling when such an implementation is needed.
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