Move (uppercase) JS builtins from js builtins object to native context.

src/interpreter/interpreter.h

Index: src/interpreter/interpreter.h
diff --git a/src/interpreter/interpreter.h b/src/interpreter/interpreter.h
index 5c332d559894b361291105f1174f3adae1200e69..5ab5e3705963d6a76c08f579cc9599d4fcd6f61c 100644
--- a/src/interpreter/interpreter.h
+++ b/src/interpreter/interpreter.h
@@ -48,7 +48,7 @@ class Interpreter {
 #undef DECLARE_BYTECODE_HANDLER_GENERATOR
 
   // Generates code to perform the binary operations via |binop_builtin|.
-  void DoBinaryOp(Builtins::JavaScript binop_builtin,
+  void DoBinaryOp(int builtin_context_index,
                   compiler::InterpreterAssembler* assembler);
 
   bool IsInterpreterTableInitialized(Handle<FixedArray> handler_table);