Enable GDBJIT interface for standalone by default.

Makefile

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 62 matching lines @@
 ifeq ($(snapshot), off)
   GYPFLAGS += -Dv8_use_snapshot='false'
 endif
 # extrachecks=on/off
 ifeq ($(extrachecks), on)
   GYPFLAGS += -Dv8_enable_extra_checks=1
 endif
 ifeq ($(extrachecks), off)
   GYPFLAGS += -Dv8_enable_extra_checks=0
 endif
-# gdbjit=on
+# gdbjit=on/off
 ifeq ($(gdbjit), on)
   GYPFLAGS += -Dv8_enable_gdbjit=1
 endif
+ifeq ($(gdbjit), off)
+  GYPFLAGS += -Dv8_enable_gdbjit=0
+endif
 # vtunejit=on
 ifeq ($(vtunejit), on)
   GYPFLAGS += -Dv8_enable_vtunejit=1
 endif
 # debuggersupport=off
 ifeq ($(debuggersupport), off)
   GYPFLAGS += -Dv8_enable_debugger_support=0
 endif
 # unalignedaccess=on
 ifeq ($(unalignedaccess), on)
@@ skipping 291 matching lines @@
             echo "CXX=$(CXX)" >> $(ENVFILE).new
 
 # Dependencies.
 # Remember to keep these in sync with the DEPS file.
 dependencies:
         svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
             --revision 1656
         svn checkout --force \
             https://src.chromium.org/chrome/trunk/deps/third_party/icu46 \
             third_party/icu --revision 205936