[ic] Encode [Keyed]StoreIC's language mode in slot kind instead of code object's flags.

src/compiler/ast-graph-builder.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/compiler/ast-graph-builder.h"
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
@@ skipping 2727 matching lines @@
 Node* AstGraphBuilder::BuildNamedLoad(Node* object, Handle<Name> name,
                                       const VectorSlotPair& feedback) {
   const Operator* op = javascript()->LoadNamed(name, feedback);
   Node* node = NewNode(op, object);
   return node;
 }
 
 
 Node* AstGraphBuilder::BuildKeyedStore(Node* object, Node* key, Node* value,
                                        const VectorSlotPair& feedback) {
+  DCHECK_EQ(feedback.vector()->GetLanguageMode(feedback.slot()),
+            language_mode());
   const Operator* op = javascript()->StoreProperty(language_mode(), feedback);
   Node* node = NewNode(op, object, key, value);
   return node;
 }
 
 
 Node* AstGraphBuilder::BuildNamedStore(Node* object, Handle<Name> name,
                                        Node* value,
                                        const VectorSlotPair& feedback) {
+  DCHECK_EQ(feedback.vector()->GetLanguageMode(feedback.slot()),
+            language_mode());
   const Operator* op =
       javascript()->StoreNamed(language_mode(), name, feedback);
   Node* node = NewNode(op, object, value);
   return node;
 }
 
 
 Node* AstGraphBuilder::BuildGlobalLoad(Handle<Name> name,
                                        const VectorSlotPair& feedback,
                                        TypeofMode typeof_mode) {
@@ skipping 542 matching lines @@
     float invocation_frequency, LoopAssignmentAnalysis* loop_assignment,
     SourcePositionTable* source_positions, int inlining_id)
     : AstGraphBuilder(local_zone, info, jsgraph, invocation_frequency,
                       loop_assignment),
       source_positions_(source_positions),
       start_position_(info->shared_info()->start_position(), inlining_id) {}
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8