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

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 83fa2fa720e7b660034d84df15ee9a3c4a2e18cb..52b2913f2c357a3db2833eeb934204d10f80c8ef 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -797,7 +797,8 @@ enum FunctionKind {
   kConciseMethod = 4,
   kConciseGeneratorMethod = kGeneratorFunction | kConciseMethod,
   kDefaultConstructor = 8,
-  kSubclassConstructor = 16
+  kBaseConstructor = 16,
+  kSubclassConstructor = 32,
 };
 
 
@@ -808,6 +809,7 @@ inline bool IsValidFunctionKind(FunctionKind kind) {
          kind == FunctionKind::kConciseMethod ||
          kind == FunctionKind::kConciseGeneratorMethod ||
          kind == FunctionKind::kDefaultConstructor ||
+         kind == FunctionKind::kBaseConstructor ||
          kind == FunctionKind::kSubclassConstructor;
 }
 
@@ -835,10 +837,25 @@ inline bool IsDefaultConstructor(FunctionKind kind) {
   return kind & FunctionKind::kDefaultConstructor;
 }
 
+
+inline bool IsBaseConstructor(FunctionKind kind) {
+  DCHECK(IsValidFunctionKind(kind));
+  return kind & FunctionKind::kBaseConstructor;
+}
+
+
 inline bool IsSubclassConstructor(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kSubclassConstructor;
 }
+
+
+inline bool IsConstructor(FunctionKind kind) {
+  DCHECK(IsValidFunctionKind(kind));
+  return kind &
+         (FunctionKind::kBaseConstructor | FunctionKind::kSubclassConstructor |
+          FunctionKind::kDefaultConstructor);
+}
 } }  // namespace v8::internal
 
 namespace i = v8::internal;