Ensure we create a valid node when DOTNET_EnableSSE2=0 is set

Author: tannergooding

src/coreclr/jit/hwintrinsicxarch.cpp

@@ -1413,8 +1413,20 @@ GenTree* Compiler::impSpecialIntrinsic(NamedIntrinsic        intrinsic,
             op2 = impSIMDPopStack();
             op1 = impSIMDPopStack();
 
-            op1     = gtFoldExpr(gtNewSimdUnOpNode(GT_NOT, retType, op1, simdBaseJitType, simdSize));
-            retNode = gtNewSimdBinOpNode(GT_AND, retType, op1, op2, simdBaseJitType, simdSize);
+            if (IsBaselineSimdIsaSupported())
+            {
+                op1     = gtFoldExpr(gtNewSimdUnOpNode(GT_NOT, retType, op1, simdBaseJitType, simdSize));
+                retNode = gtNewSimdBinOpNode(GT_AND, retType, op1, op2, simdBaseJitType, simdSize);
+            }
+            else
+            {
+                // We need to ensure we import even if SSE2 is disabled
+                assert(intrinsic == NI_SSE_AndNot);
+
+                op3     = gtNewAllBitsSetConNode(retType);
+                op1     = gtNewSimdHWIntrinsicNode(retType, op1, op3, NI_SSE_Xor, simdBaseJitType, simdSize);
+                retNode = gtNewSimdHWIntrinsicNode(retType, op1, op2, NI_SSE_And, simdBaseJitType, simdSize);
+            }
             break;
         }