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* [CMake] Match LLVM EH and RTTI defaultsRichard-Qin-X2026-08-011-10/+7
| | | | Disable C++ exceptions and RTTI by default while retaining explicit, validated opt-in switches. Replace the arena's exception syntax with an RAII construction guard so both configurations share one implementation.
* [CodeGen] Build the core MachineIR object modelRichard-Qin-X2026-08-011-0/+205
Add arena-owned, address-stable MachineFunction, MachineBasicBlock, and MachineInstr nodes with intrusive layout and instruction lists. Model every required MachineOperand category, reciprocal ties, source state, and immutable per-instruction memory references. Implement physical and virtual register def-use chains whose back-links survive operand vector moves, plus vreg properties, tombstones, live-ins, reserved registers, and atomic CFG updates. Exercise ownership, reallocation, unlink/relink, cross-function rejection, and sanitizer paths.