new classes: implement new.target passing to superclass constructor.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 0248bb1600d8e8487fa2d1ffae2f9fba33a04013..73cc89d936f653409b32b2cfd94e216c2b788a4b 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -527,9 +527,11 @@ enum CallFunctionFlags {
 
 
 enum CallConstructorFlags {
-  NO_CALL_CONSTRUCTOR_FLAGS,
+  NO_CALL_CONSTRUCTOR_FLAGS = 0,
   // The call target is cached in the instruction stream.
-  RECORD_CONSTRUCTOR_TARGET
+  RECORD_CONSTRUCTOR_TARGET = 1,
+  SUPER_CONSTRUCTOR_CALL = 1 << 1,
+  SUPER_CALL_RECORD_TARGET = SUPER_CONSTRUCTOR_CALL | RECORD_CONSTRUCTOR_TARGET
 };