[strong] Implement strong mode restrictions on property access

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 952 matching lines @@
     check_false->AppendInput(graph()->zone(), if_false);
     check_true = if_true;
   }
 
   // Fast case, because variable is not shadowed. Perform global object load.
   Unique<Name> name = Unique<Name>::CreateUninitialized(access.name());
   Node* global = graph()->NewNode(
       javascript()->LoadContext(0, Context::GLOBAL_OBJECT_INDEX, true), context,
       context, effect);
   Node* fast = graph()->NewNode(
-      javascript()->LoadNamed(name, access.feedback(), access.mode()), global,
-      context, state1, state2, global, check_true);
+      javascript()->LoadNamed(name, access.feedback(), SLOPPY, access.mode()),
+      global, context, state1, state2, global, check_true);
 
   // Slow case, because variable potentially shadowed. Perform dynamic lookup.
   uint32_t check_bitset = DynamicGlobalAccess::kFullCheckRequired;
   Node* slow = graph()->NewNode(
       javascript()->LoadDynamicGlobal(access.name(), check_bitset,
                                       access.feedback(), access.mode()),
       context, context, state1, state2, effect, check_false);
 
   // Replace value, effect and control uses accordingly.
   Node* new_control =
@@ skipping 626 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSTypedLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8