Add AVX10.2 Intrinsics

[sayantn]

Note: requires rust-lang/rust#153068, contains a temporary fix in order to pass tests

• zero-extending partial moves
• sum of absolute differences
• dot product
• saturating truncating float->integer conversions
• minmax
• saturating float->int8 conversions
• packing float32->float16 conversions
• biasing float16->float8 conversions
• float16->float8 conversions
• float8->float16 conversions
• bfloat16 instructions
  • bfloat16 minmax
  • saturating bfloat16->int8 conversions

BFloat16 intrinsics cannot be done now, because the LLVM intrinsics use bf16 vectors, and we cannot link to them directly. Requires rust-lang/rust#140763 or some other workaround.

AVX10_V1_AUX intrinsics

These instructions are supported in a subset of AVX10.2, but neither GCC nor LLVM supports this feature yet.
TODO: Modify the #[target_feature] attribute once LLVM starts supporting this.

• regular and packing float16->float8 conversions
• packing float32->float16 conversions
• biasing float16->float8 conversions
• float8->float16 conversions
• integer dot product instructions

LLVM Bugs

• single-element minmax instructions: Miscompilation of VMINMAXS{H,S,D} intrinsics llvm/llvm-project#184245
• saturating float->int8 conversions: Miscompilation of VCVT{T}P{H,S}2I{U}BS intrinsics llvm/llvm-project#184251