Add inlining for intrinsics.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index fe0280b393c03cd6bf4d2b3c79f48eb4fdd6fcec..6892879f7cc0c6154fbb561c00e5822f44379bbc 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -355,6 +355,41 @@ class RepresentationSelector {
     }
   }
 
+  void VisitIsSmi(Node* node) {
+    ProcessInput(node, 0, kMachAnyTagged);
+    if (lower()) {
+      Node* is_tagged = jsgraph_->graph()->NewNode(
+          jsgraph_->machine()->WordAnd(), node->InputAt(0),
+          jsgraph_->Int32Constant(static_cast<int>(kSmiTagMask)));
+      Node* is_smi = jsgraph_->graph()->NewNode(
+          jsgraph_->machine()->WordEqual(), is_tagged,
+          jsgraph_->Int32Constant(kSmiTag));
+      DeferReplacement(node, is_smi);
+    }
+    SetOutput(node, kRepBit | kTypeBool);
+  }
+
+  void VisitIsNonNegativeSmi(Node* node) {
+    ProcessInput(node, 0, kMachAnyTagged);
+    if (lower()) {
+      Node* is_tagged = jsgraph_->graph()->NewNode(
+          jsgraph_->machine()->WordAnd(), node->InputAt(0),
+          jsgraph_->Int32Constant(static_cast<int>(kSmiTagMask)));
+      Node* is_smi = jsgraph_->graph()->NewNode(
+          jsgraph_->machine()->WordEqual(), is_tagged,
+          jsgraph_->Int32Constant(kSmiTag));
+      Node* is_non_neg = jsgraph_->graph()->NewNode(
+          jsgraph_->machine()->Is32()
+              ? jsgraph_->machine()->Int32LessThanOrEqual()
+              : jsgraph_->machine()->Int64LessThanOrEqual(),
+          jsgraph_->Int32Constant(0), node->InputAt(0));
+      Node* is_non_neg_smi = jsgraph_->graph()->NewNode(
+          jsgraph_->machine()->Word32And(), is_smi, is_non_neg);
+      DeferReplacement(node, is_non_neg_smi);
+    }
+    SetOutput(node, kRepBit | kTypeBool);
+  }
+
   const Operator* Int32Op(Node* node) {
     return changer_->Int32OperatorFor(node->opcode());
   }
@@ -833,6 +868,10 @@ class RepresentationSelector {
         }
         SetOutput(node, kMachAnyTagged);
         break;
+      case IrOpcode::kIsSmi:
+        return VisitIsSmi(node);
+      case IrOpcode::kIsNonNegativeSmi:
+        return VisitIsNonNegativeSmi(node);
       default:
         VisitInputs(node);
         break;
@@ -947,7 +986,6 @@ void SimplifiedLowering::DoLoadField(Node* node) {
   node->set_op(machine()->Load(access.machine_type));
   Node* offset = jsgraph()->Int32Constant(access.offset - access.tag());
   node->InsertInput(zone(), 1, offset);
-  node->AppendInput(zone(), graph()->start());
 }