llvm-project

9f7c5cda - [CIR][AArch64] Lower AArch64 scalar saturating subtract intrinsics (#213658)

[CIR][AArch64] Lower AArch64 scalar saturating subtract intrinsics (#213658) ### summary This PR is a follow-up to #207189 and adds CIR lowering support for the eight AArch64 scalar signed and unsigned saturating subtract intrinsics. It reuses the common Neon SISD lowering infrastructure introduced by #209389. The legacy CodeGen tests are migrated to the ACLE-organized subtraction test file with corresponding CIR and LLVM checks. Assisted by : gpt5.6-sol high