[es6] Perform the IsConstructor test in GetSuperConstructor.

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 ddcc0a7e64334108a482f79a4ca0403cfd86e6df..2d4d8931029aee150fe131b688366437e25a990e 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -259,6 +259,11 @@ class V8_EXPORT_PRIVATE BytecodeArrayBuilder final
   BytecodeArrayBuilder& LogicalNot();
   BytecodeArrayBuilder& TypeOf();
 
+  // Expects a heap object in the accumulator. Returns its super constructor in
+  // the register |out| if it passes the IsConstructor test. Otherwise, it
+  // throws a TypeError exception.
+  BytecodeArrayBuilder& GetSuperConstructor(Register out);
+
   // Deletes property from an object. This expects that accumulator contains
   // the key to be deleted and the register contains a reference to the object.
   BytecodeArrayBuilder& Delete(Register object, LanguageMode language_mode);