Mark SIMD assignments as related to SIMD intrinsics on x86

Author: tannergooding

src/coreclr/jit/codegenxarch.cpp

@@ -1980,7 +1980,7 @@ void CodeGen::genMultiRegStoreToSIMDLocal(GenTreeLclVar* lclNode)
     }
     genProduceReg(lclNode);
 #else  // !UNIX_AMD64_ABI
-    assert(!"Multireg store to SIMD reg not supported on X64 Windows");
+    assert(!"Multireg store to SIMD reg not supported on Windows");
 #endif // !UNIX_AMD64_ABI
 }
 #endif // FEATURE_SIMD

src/coreclr/jit/gentree.cpp

@@ -6759,9 +6759,9 @@ GenTreeOp* Compiler::gtNewAssignNode(GenTree* dst, GenTree* src)
     }
     dst->gtFlags |= GTF_DONT_CSE;
 
-/* Create the assignment node */
+#if defined(FEATURE_SIMD) && !defined(TARGET_X86)
+    // TODO-CQ: x86 Windows supports multi-reg returns but not SIMD multi-reg returns
 
-#if FEATURE_SIMD
     if (varTypeIsSIMD(dst->gtType))
     {
         // We want to track SIMD assignments as being intrinsics since they
@@ -6773,6 +6773,8 @@ GenTreeOp* Compiler::gtNewAssignNode(GenTree* dst, GenTree* src)
     }
 #endif // FEATURE_SIMD
 
+    /* Create the assignment node */
+
     GenTreeOp* asg = gtNewOperNode(GT_ASG, dst->TypeGet(), dst, src)->AsOp();
 
     /* Mark the expression as containing an assignment */