[clang] [llvm] [HLSL][DXIL][SPIRV] Create llvm dot intrinsic and use for HLSL (PR #102872)

[Farzon Lotfi via cfe-commits]

================
@@ -1045,6 +1045,15 @@ let IntrProperties = [IntrNoMem, IntrSpeculatable, IntrWillReturn] in {
   def int_nearbyint : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>]>;
   def int_round : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>]>;
   def int_roundeven    : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>]>;
+  def int_udot : Intrinsic<[LLVMVectorElementType<0>],
+                           [llvm_anyint_ty, LLVMScalarOrSameVectorWidth<0, LLVMVectorElementType<0>>],
+                           [IntrNoMem, IntrWillReturn, Commutative] >;
+  def int_sdot : Intrinsic<[LLVMVectorElementType<0>],
+                           [llvm_anyint_ty, LLVMScalarOrSameVectorWidth<0, LLVMVectorElementType<0>>],
+                           [IntrNoMem, IntrWillReturn, Commutative] >;
+  def int_fdot : Intrinsic<[LLVMVectorElementType<0>],
----------------
farzonl wrote:

I had a cleanup I wanted to do to swith to `DefaultAttrsIntrinsic` I don't remember what the full list of defaut attributes are at the moment. but  i'm pretty sure only one we would need to pass in if we switch is `Commutative`.

https://github.com/llvm/llvm-project/pull/102872