llvm-project

6e687f8d - [MIR][AMDGPU] Serialize register allocation anti-hints (#218073)

[MIR][AMDGPU] Serialize register allocation anti-hints (#218073) This PR adds MIR print and parse support for the register allocation anti-hints through a per vreg anti-hints: [ .. ] field in the registers: section. The printer only emits the anti-hint registers only when the it is non-empty to keep existing tests unchanged. ## Stack PR **2/4**. Depends on #218071. Next: Apply Occupancy-Aware allocation anti-hints #218074.