[turbofan] Refactor IsSame into NodeProperties.

src/compiler/js-inlining.cc

Index: src/compiler/js-inlining.cc
diff --git a/src/compiler/js-inlining.cc b/src/compiler/js-inlining.cc
index 1717d4118a5070b39819ae82cb144f0a457e8178..3869a3ef9ba326ddcd6568900845dfd8cc113c56 100644
--- a/src/compiler/js-inlining.cc
+++ b/src/compiler/js-inlining.cc
@@ -278,19 +278,6 @@ Node* JSInliner::CreateTailCallerFrameState(Node* node, Node* frame_state) {
 
 namespace {
 
-// TODO(turbofan): Shall we move this to the NodeProperties? Or some (untyped)
-// alias analyzer?
-bool IsSame(Node* a, Node* b) {
-  if (a == b) {
-    return true;
-  } else if (a->opcode() == IrOpcode::kCheckHeapObject) {
-    return IsSame(a->InputAt(0), b);
-  } else if (b->opcode() == IrOpcode::kCheckHeapObject) {
-    return IsSame(a, b->InputAt(0));
-  }
-  return false;
-}
-
 // TODO(bmeurer): Unify this with the witness helper functions in the
 // js-builtin-reducer.cc once we have a better understanding of the
 // map tracking we want to do, and eventually changed the CheckMaps
@@ -305,7 +292,7 @@ bool IsSame(Node* a, Node* b) {
 bool NeedsConvertReceiver(Node* receiver, Node* effect) {
   for (Node* dominator = effect;;) {
     if (dominator->opcode() == IrOpcode::kCheckMaps &&
-        IsSame(dominator->InputAt(0), receiver)) {
+        NodeProperties::IsSame(dominator->InputAt(0), receiver)) {
       // Check if all maps have the given {instance_type}.
       ZoneHandleSet<Map> const& maps =
           CheckMapsParametersOf(dominator->op()).maps();