new classes: assert that constructors are not callable and rewrite 'return;'

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 61daada4b9ae57c13bb34bd15d84d6fab5ff5025..d66f839bf75ad7d215ad4095eacf9dd49f3cc584 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7195,6 +7195,7 @@ class SharedFunctionInfo: public HeapObject {
     kIsConciseMethod,
     kIsAccessorFunction,
     kIsDefaultConstructor,
+    kIsBaseConstructor,
     kIsSubclassConstructor,
     kIsAsmFunction,
     kDeserialized,
@@ -7203,7 +7204,7 @@ class SharedFunctionInfo: public HeapObject {
   // Add hints for other modes when they're added.
   STATIC_ASSERT(LANGUAGE_END == 3);
 
-  class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 6> {};
+  class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 7> {};
 
   class DeoptCountBits : public BitField<int, 0, 4> {};
   class OptReenableTriesBits : public BitField<int, 4, 18> {};