[clang] [llvm] [HLSL] Implementation of dot intrinsic (PR #81190)

[Farzon Lotfi via cfe-commits]

================
@@ -19,4 +19,9 @@ def int_dx_flattened_thread_id_in_group : 
Intrinsic<[llvm_i32_ty], [], [IntrNoMe
 
 def int_dx_create_handle : ClangBuiltin<"__builtin_hlsl_create_handle">,
     Intrinsic<[ llvm_ptr_ty ], [llvm_i8_ty], [IntrWillReturn]>;
-}
+
+def int_dx_dot : 
+    Intrinsic<[LLVMVectorElementType<0>], 
+    [llvm_anyvector_ty, LLVMScalarOrSameVectorWidth<0, 
LLVMVectorElementType<0>>],
+    [IntrNoMem, IntrWillReturn, Commutative] >;
----------------
farzonl wrote:

This might have to come later when I start to work  on lowering.

https://github.com/llvm/llvm-project/pull/81190
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