[esnext] Fix various callsites to use is_resumable, not is_generator

src/messages.h

Index: src/messages.h
diff --git a/src/messages.h b/src/messages.h
index dc599d755ffb3c6c975557c6f7eb1074d8e97e1c..d25ebbffb30f37b21b7571435a2c5925225de5ab 100644
--- a/src/messages.h
+++ b/src/messages.h
@@ -120,10 +120,8 @@ class CallSite {
   T(DefineDisallowed, "Cannot define property:%, object is not extensible.")   \
   T(DetachedOperation, "Cannot perform % on a detached ArrayBuffer")           \
   T(DuplicateTemplateProperty, "Object template has duplicate property '%'")   \
-  T(ExtendsValueGenerator,                                                     \
-    "Class extends value % may not be a generator function")                   \
-  T(ExtendsValueNotFunction,                                                   \
-    "Class extends value % is not a function or null")                         \
+  T(ExtendsValueNotConstructor,                                                \
+    "Class extends value % is not a constructor or null")                      \
   T(FirstArgumentNotRegExp,                                                    \
     "First argument to % must not be a regular expression")                    \
   T(FunctionBind, "Bind must be called on a function")                         \