[interpreter] Support for ES6 class literals.

test/unittests/interpreter/bytecode-array-builder-unittest.cc

Index: test/unittests/interpreter/bytecode-array-builder-unittest.cc
diff --git a/test/unittests/interpreter/bytecode-array-builder-unittest.cc b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
index f0ec7f72472674a0b053d0b1058dba8acd19fa64..66e13fb8ac2ed33e2f0e5a3d8cb4f1f6b5271ada 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -55,6 +55,9 @@ TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
   builder.MoveRegister(reg, other);
   builder.MoveRegister(reg, wide);
 
+  // Prototype info for classes.
+  builder.LoadPrototypeOrInitialMap();
+
   // Emit global load / store operations.
   Factory* factory = isolate()->factory();
   Handle<String> name = factory->NewStringFromStaticChars("var_name");