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* [CodeGen] Add MachineFrameInfoRichard-Qin-X2026-08-011-12/+66
| | | | Model stable frame indices, stack object kinds, tombstones, lifetimes, and frozen layouts. Validate owned frame references in the builder and verifier, and remap complete frame state during MachineFunction cloning.
* [CodeGen] Add explicit MachineFunction cloningRichard-Qin-X2026-08-011-0/+441
Deep-clone the live MachineIR graph with deterministic identity maps while rebuilding CFG, def-use, ties, register configuration, and memory operand ownership. Verify both source and destination and omit detached arena history.