[turbofan] Move global constant optimization to AstGraphBuilder.

src/compiler/js-typed-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 797 matching lines @@
   Node* const input = node->InputAt(0);
   Reduction reduction = ReduceJSToStringInput(input);
   if (reduction.Changed()) {
     ReplaceWithValue(node, reduction.replacement());
     return reduction;
   }
   return NoChange();
 }
 
 
-Reduction JSTypedLowering::ReduceJSLoadGlobal(Node* node) {
-  // Optimize global constants like "undefined", "Infinity", and "NaN".
-  Handle<Name> name = LoadGlobalParametersOf(node->op()).name();
-  Handle<Object> constant_value = factory()->GlobalConstantFor(name);
-  if (!constant_value.is_null()) {
-    Node* constant = jsgraph()->Constant(constant_value);
-    ReplaceWithValue(node, constant);
-    return Replace(constant);
-  }
-  return NoChange();
-}
-
-
 Reduction JSTypedLowering::ReduceJSLoadNamed(Node* node) {
   DCHECK_EQ(IrOpcode::kJSLoadNamed, node->opcode());
   Node* receiver = NodeProperties::GetValueInput(node, 0);
   Type* receiver_type = NodeProperties::GetType(receiver);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
   Handle<Name> name = LoadNamedParametersOf(node->op()).name();
   // Optimize "length" property of strings.
   if (name.is_identical_to(factory()->length_string()) &&
       receiver_type->Is(Type::String())) {
@@ skipping 924 matching lines @@
     case IrOpcode::kJSModulus:
       return ReduceJSModulus(node);
     case IrOpcode::kJSUnaryNot:
       return ReduceJSUnaryNot(node);
     case IrOpcode::kJSToBoolean:
       return ReduceJSToBoolean(node);
     case IrOpcode::kJSToNumber:
       return ReduceJSToNumber(node);
     case IrOpcode::kJSToString:
       return ReduceJSToString(node);
-    case IrOpcode::kJSLoadGlobal:
-      return ReduceJSLoadGlobal(node);
     case IrOpcode::kJSLoadNamed:
       return ReduceJSLoadNamed(node);
     case IrOpcode::kJSLoadProperty:
       return ReduceJSLoadProperty(node);
     case IrOpcode::kJSStoreProperty:
       return ReduceJSStoreProperty(node);
     case IrOpcode::kJSLoadContext:
       return ReduceJSLoadContext(node);
     case IrOpcode::kJSStoreContext:
       return ReduceJSStoreContext(node);
@@ skipping 58 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSTypedLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8