[turbofan] Fix lowering of typed loads/stores.

test/unittests/compiler/js-builtin-reducer-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 "test/unittests/compiler/graph-unittest.h"
 
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/typer.h"
@@ skipping 17 matching lines @@
     JSBuiltinReducer reducer(&jsgraph);
     return reducer.Reduce(node);
   }
 
   Node* Parameter(Type* t, int32_t index = 0) {
     Node* n = graph()->NewNode(common()->Parameter(index), graph()->start());
     NodeProperties::SetBounds(n, Bounds(Type::None(), t));
     return n;
   }
 
-  Node* UndefinedConstant() {
-    return HeapConstant(
-        Unique<HeapObject>::CreateImmovable(factory()->undefined_value()));
-  }
-
   JSOperatorBuilder* javascript() { return &javascript_; }
 
  private:
   JSOperatorBuilder javascript_;
 };
 
 
 namespace {
 
 // TODO(mstarzinger): Find a common place and unify with test-js-typed-lowering.
@@ skipping 180 matching lines @@
     Reduction r = Reduce(call);
 
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(), IsTruncateFloat64ToFloat32(p0));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8