[turbofan] Move global constant optimization to AstGraphBuilder.

test/unittests/compiler/js-typed-lowering-unittest.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-operator.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 844 matching lines @@
           r.replacement(),
           IsStoreElement(
               access, IsIntPtrConstant(bit_cast<intptr_t>(&backing_store[0])),
               key, value, effect, control));
     }
   }
 }
 
 
 // -----------------------------------------------------------------------------
-// JSLoadGlobal
-
-
-TEST_F(JSTypedLoweringTest, JSLoadGlobalConstants) {
-  Handle<String> names[] = {
-      Handle<String>(isolate()->heap()->undefined_string(), isolate()),
-      Handle<String>(isolate()->heap()->infinity_string(), isolate()),
-      Handle<String>(isolate()->heap()->nan_string(), isolate())  // --
-  };
-  Matcher<Node*> matches[] = {
-      IsHeapConstant(
-          Handle<HeapObject>(isolate()->heap()->undefined_value(), isolate())),
-      IsNumberConstant(std::numeric_limits<double>::infinity()),
-      IsNumberConstant(IsNaN())  // --
-  };
-
-  VectorSlotPair feedback;
-  Node* global = UndefinedConstant();
-  Node* vector = UndefinedConstant();
-  Node* context = UndefinedConstant();
-  Node* effect = graph()->start();
-  Node* control = graph()->start();
-
-  for (size_t i = 0; i < arraysize(names); i++) {
-    Reduction r = Reduce(graph()->NewNode(
-        javascript()->LoadGlobal(names[i], feedback), context, global, vector,
-        context, EmptyFrameState(), EmptyFrameState(), effect, control));
-
-    ASSERT_TRUE(r.Changed());
-    EXPECT_THAT(r.replacement(), matches[i]);
-  }
-}
-
-
-// -----------------------------------------------------------------------------
 // JSLoadNamed
 
 
 TEST_F(JSTypedLoweringTest, JSLoadNamedStringLength) {
   VectorSlotPair feedback;
   Handle<Name> name = factory()->length_string();
   Node* const receiver = Parameter(Type::String(), 0);
   Node* const vector = Parameter(Type::Internal(), 1);
   Node* const context = UndefinedConstant();
   Node* const effect = graph()->start();
@@ skipping 233 matching lines @@
   EXPECT_THAT(r.replacement(),
               IsFinish(IsAllocate(IsNumberConstant(Context::SizeFor(
                                       Context::MIN_CONTEXT_SLOTS)),
                                   effect, control),
                        _));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8