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

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index 378ab739e558a09923d4fac2617032f983fb04a2..2b25400cabd3b9b2d2f03fbd3cc5f501ea6ab254 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -385,6 +385,10 @@ class V8_EXPORT_PRIVATE BytecodeArrayBuilder final
             OperandType... operand_types>
   friend class BytecodeNodeBuilder;
 
+  const FeedbackVectorSpec* feedback_vector_spec() const {
+    return literal_->feedback_vector_spec();
+  }
+
   // Returns the current source position for the given |bytecode|.
   INLINE(BytecodeSourceInfo CurrentSourcePosition(Bytecode bytecode));
 
@@ -427,6 +431,7 @@ class V8_EXPORT_PRIVATE BytecodeArrayBuilder final
   }
 
   Zone* zone_;
+  FunctionLiteral* literal_;
   bool bytecode_generated_;
   ConstantArrayBuilder constant_array_builder_;
   HandlerTableBuilder handler_table_builder_;