[CIR] Add canonicalizer for CleanupScopeOp (#191084) This change adds a canonicalizer for CleanupScopeOp that erases any cleanup scope with a trivial cleanup region, inlining the contents of the body region into the block in place of the cleanup scope op. It also erases any EH-only cleanup scope whose body region contains only a yield operation, dropping the cleanup region contents even if they were not trivial because the EH cleanup is not reachable in this case. Assisted-by: Cursor / claude-4.6-opus-high
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