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

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index 038db5ba63f956cd4e95f70b29931d338edb12b8..29e166ec909b60b29b279c0233058251ebe8aa19 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -1029,6 +1029,7 @@ void BytecodeGraphBuilder::BuildNamedStore(LanguageMode language_mode) {
   VectorSlotPair feedback =
       CreateVectorSlotPair(bytecode_iterator().GetIndexOperand(2));
 
+  DCHECK_EQ(feedback.vector()->GetLanguageMode(feedback.slot()), language_mode);

[mvstanton, 2017/02/06 08:23:51]

Nice assert to add, thx!

   const Operator* op = javascript()->StoreNamed(language_mode, name, feedback);
   Node* node = NewNode(op, object, value);
   environment()->RecordAfterState(node, Environment::kAttachFrameState);
@@ -1052,6 +1053,7 @@ void BytecodeGraphBuilder::BuildKeyedStore(LanguageMode language_mode) {
   VectorSlotPair feedback =
       CreateVectorSlotPair(bytecode_iterator().GetIndexOperand(2));
 
+  DCHECK_EQ(feedback.vector()->GetLanguageMode(feedback.slot()), language_mode);
   const Operator* op = javascript()->StoreProperty(language_mode, feedback);
   Node* node = NewNode(op, object, key, value);
   environment()->RecordAfterState(node, Environment::kAttachFrameState);