llvm-project

f55281ac - [RISCV] Add a high half PACKW+PACK pattern for RV64. (#152760)

[RISCV] Add a high half PACKW+PACK pattern for RV64. (#152760) Similar to the PACKH+PACK pattern for RV32. We can end up with the shift left by 32 neeed by our PACK pattern hidden behind an OR that packs 2 half words.