[turbofan] Introduce a dedicated CheckBounds operator.

src/compiler/effect-control-linearizer.cc

Index: src/compiler/effect-control-linearizer.cc
diff --git a/src/compiler/effect-control-linearizer.cc b/src/compiler/effect-control-linearizer.cc
index 8cac96feadf06b4aa9b5fbac3662b782afba7aee..e867a7c5dc785df9203935c03b7f41453f3c39f1 100644
--- a/src/compiler/effect-control-linearizer.cc
+++ b/src/compiler/effect-control-linearizer.cc
@@ -416,6 +416,9 @@ bool EffectControlLinearizer::TryWireInStateEffect(Node* node,
     case IrOpcode::kTruncateTaggedToFloat64:
       state = LowerTruncateTaggedToFloat64(node, *effect, *control);
       break;
+    case IrOpcode::kCheckBounds:
+      state = LowerCheckBounds(node, frame_state, *effect, *control);
+      break;
     case IrOpcode::kCheckedUint32ToInt32:
       state = LowerCheckedUint32ToInt32(node, frame_state, *effect, *control);
       break;
@@ -765,6 +768,22 @@ EffectControlLinearizer::LowerTruncateTaggedToFloat64(Node* node, Node* effect,
 }
 
 EffectControlLinearizer::ValueEffectControl
+EffectControlLinearizer::LowerCheckBounds(Node* node, Node* frame_state,
+                                          Node* effect, Node* control) {
+  Node* index = node->InputAt(0);
+  Node* limit = node->InputAt(1);
+
+  Node* check = graph()->NewNode(machine()->Uint32LessThan(), index, limit);
+  control = effect = graph()->NewNode(common()->DeoptimizeUnless(), check,
+                                      frame_state, effect, control);
+
+  // Make sure the lowered node does not appear in any use lists.
+  node->TrimInputCount(0);
+
+  return ValueEffectControl(index, effect, control);
+}
+
+EffectControlLinearizer::ValueEffectControl
 EffectControlLinearizer::LowerCheckedUint32ToInt32(Node* node,
                                                    Node* frame_state,
                                                    Node* effect,
@@ -852,26 +871,36 @@ EffectControlLinearizer::LowerCheckedTaggedToInt32(Node* node,
 
   // In the non-Smi case, check the heap numberness, load the number and convert
   // to int32.
-  // TODO(jarin) Propagate/handle possible truncations here.
   Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
-  ValueEffectControl number_state = BuildCheckedHeapNumberOrOddballToFloat64(
-      value, frame_state, effect, if_false);
-  number_state =
-      BuildCheckedFloat64ToInt32(number_state.value, frame_state,
-                                 number_state.effect, number_state.control);
+  Node* efalse = effect;
+  Node* vfalse;
+  {
+    Node* value_map = efalse =
+        graph()->NewNode(simplified()->LoadField(AccessBuilder::ForMap()),
+                         value, efalse, if_false);
+    Node* check = graph()->NewNode(machine()->WordEqual(), value_map,
+                                   jsgraph()->HeapNumberMapConstant());
+    if_false = efalse = graph()->NewNode(common()->DeoptimizeUnless(), check,
+                                         frame_state, efalse, if_false);
+    vfalse = efalse = graph()->NewNode(
+        simplified()->LoadField(AccessBuilder::ForHeapNumberValue()), value,
+        efalse, if_false);
+    ValueEffectControl state =
+        BuildCheckedFloat64ToInt32(vfalse, frame_state, efalse, if_false);
+    if_false = state.control;
+    efalse = state.effect;
+    vfalse = state.value;
+  }
 
-  Node* merge =
-      graph()->NewNode(common()->Merge(2), if_true, number_state.control);
-  Node* effect_phi = graph()->NewNode(common()->EffectPhi(2), etrue,
-                                      number_state.effect, merge);
-  Node* result =
-      graph()->NewNode(common()->Phi(MachineRepresentation::kWord32, 2), vtrue,
-                       number_state.value, merge);
+  control = graph()->NewNode(common()->Merge(2), if_true, if_false);
+  effect = graph()->NewNode(common()->EffectPhi(2), etrue, efalse, control);
+  value = graph()->NewNode(common()->Phi(MachineRepresentation::kWord32, 2),
+                           vtrue, vfalse, control);
 
   // Make sure the lowered node does not appear in any use lists.
   node->TrimInputCount(0);
 
-  return ValueEffectControl(result, effect_phi, merge);
+  return ValueEffectControl(value, effect, control);
 }
 
 EffectControlLinearizer::ValueEffectControl