Disable some changes tests on ARM64. Also, fix the changes lowering to not use the more expensive T…

src/compiler/change-lowering.cc

Index: src/compiler/change-lowering.cc
diff --git a/src/compiler/change-lowering.cc b/src/compiler/change-lowering.cc
index 2348dd55177c2b6abf2b695f5162477b19d7f8b8..1024f02b1d7e64f2f9b4fb9707c997958b46360f 100644
--- a/src/compiler/change-lowering.cc
+++ b/src/compiler/change-lowering.cc
@@ -27,12 +27,9 @@ Reduction ChangeLowering::Reduce(Node* node) {
     case IrOpcode::kChangeTaggedToFloat64:
       return ChangeTaggedToFloat64(node->InputAt(0), control);
     case IrOpcode::kChangeTaggedToInt32:
+      return ChangeTaggedToI32(node->InputAt(0), control, true);
     case IrOpcode::kChangeTaggedToUint32:
-      // ToInt32 and ToUint32 perform exactly the same operation, just the
-      // interpretation of the resulting 32 bit value is different, so we can
-      // use the same subgraph for both operations.
-      // See ECMA-262 9.5: ToInt32 and ECMA-262 9.6: ToUint32.
-      return ChangeTaggedToInt32(node->InputAt(0), control);
+      return ChangeTaggedToI32(node->InputAt(0), control, false);
     case IrOpcode::kChangeUint32ToTagged:
       return ChangeUint32ToTagged(node->InputAt(0), control);
     default:
@@ -170,7 +167,8 @@ Reduction ChangeLowering::ChangeInt32ToTagged(Node* val, Node* control) {
 }
 
 
-Reduction ChangeLowering::ChangeTaggedToInt32(Node* val, Node* control) {
+Reduction ChangeLowering::ChangeTaggedToI32(Node* val, Node* control,
+                                            bool is_signed) {
   STATIC_ASSERT(kSmiTag == 0);
   STATIC_ASSERT(kSmiTagMask == 1);
 
@@ -179,8 +177,9 @@ Reduction ChangeLowering::ChangeTaggedToInt32(Node* val, Node* control) {
   Node* branch = graph()->NewNode(common()->Branch(), tag, control);
 
   Node* if_true = graph()->NewNode(common()->IfTrue(), branch);
-  Node* change = graph()->NewNode(machine()->TruncateFloat64ToInt32(),
-                                  LoadHeapNumberValue(val, if_true));
+  Operator* op = is_signed ? machine()->ChangeFloat64ToInt32()
+                           : machine()->ChangeFloat64ToUint32();
+  Node* change = graph()->NewNode(op, LoadHeapNumberValue(val, if_true));
 
   Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
   Node* number = ChangeSmiToInt32(val);