[clang] [llvm] [AMDGPU] Add dot product patterns with saturating add (clamp) (PR #187945)

[Matt Arsenault via cfe-commits]

================
@@ -16946,6 +16946,73 @@ SDValue SITargetLowering::performAddCombine(SDNode *N,
   return SDValue();
 }
 
+// Try to fold saturating add with dot product intrinsic into dot instruction
+// with clamp. Matches patterns like:
+// uaddsat(dot4(..., 0), c) -> dot4(..., c) clamp
+// uaddsat(dot2(..., 0), c) -> dot2(..., c) clamp
+SDValue SITargetLowering::performSatAddCombine(SDNode *N,
----------------
arsenm wrote:

Is this version still tested? 

https://github.com/llvm/llvm-project/pull/187945