Report syntax errors in natives when building with mksnapshot.

src/factory.h

Index: src/factory.h
===================================================================
--- src/factory.h	(revision 11679)
+++ src/factory.h	(working copy)
@@ -338,6 +338,7 @@
 
   Handle<Object> NewError(const char* maker, const char* type,
                           Handle<JSArray> args);
+  Handle<String> EmergencyNewError(const char* type, Handle<JSArray> args);

[ulan, 2012/05/31 08:48:52]

Consider NewEmergencyError().

[Erik Corry, 2012/05/31 12:25:17]

The error is normal, it's just happening at a bad moment, so I prefer the
current name.

   Handle<Object> NewError(const char* maker, const char* type,
                           Vector< Handle<Object> > args);
   Handle<Object> NewError(const char* type,