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

src/ast-value-factory.h

Index: src/ast-value-factory.h
diff --git a/src/ast-value-factory.h b/src/ast-value-factory.h
index dd079d3ebd89217cf8188a02fc5b811378cc8b31..47702279421bcb3139ed735733ff1b7710f1bec2 100644
--- a/src/ast-value-factory.h
+++ b/src/ast-value-factory.h
@@ -260,7 +260,8 @@ class AstValue : public ZoneObject {
   F(this, "this")                                       \
   F(use_asm, "use asm")                                 \
   F(use_strict, "use strict")                           \
-  F(value, "value")
+  F(value, "value")                                     \
+  F(is_construct_call, "_IsConstructCall")
 
 #define OTHER_CONSTANTS(F) \
   F(true_value)            \