Enable assertions and debugging code in the release...

src/SConscript

 # Copyright 2008 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 86 matching lines @@
     unicode.cc
     usage-analyzer.cc
     utils.cc
     v8-counters.cc
     v8.cc
     v8threads.cc
     variables.cc
     version.cc
     virtual-frame.cc
     zone.cc
+
+    objects-debug.cc
+    prettyprinter.cc
+    regexp-macro-assembler-tracer.cc
     """),
   'arch:arm': Split("""
     arm/builtins-arm.cc
     arm/codegen-arm.cc
     arm/constants-arm.cc
     arm/cpu-arm.cc
     arm/debug-arm.cc
     arm/disasm-arm.cc
     arm/fast-codegen-arm.cc
     arm/frames-arm.cc
@@ skipping 47 matching lines @@
     """),
   'simulator:arm': ['arm/simulator-arm.cc'],
   'os:freebsd': ['platform-freebsd.cc', 'platform-posix.cc'],
   'os:openbsd': ['platform-openbsd.cc', 'platform-posix.cc'],
   'os:linux':   ['platform-linux.cc', 'platform-posix.cc'],
   'os:android': ['platform-linux.cc', 'platform-posix.cc'],
   'os:macos':   ['platform-macos.cc', 'platform-posix.cc'],
   'os:nullos':  ['platform-nullos.cc'],
   'os:win32':   ['platform-win32.cc'],
   'mode:release': [],
-  'mode:debug': [
-    'objects-debug.cc', 'prettyprinter.cc', 'regexp-macro-assembler-tracer.cc'
-  ]
+  'mode:debug': []
 }
 
 
 D8_FILES = {
   'all': [
     'd8.cc', 'd8-debug.cc'
   ],
   'os:linux': [
     'd8-posix.cc'
   ],
@@ skipping 87 matching lines @@
       snapshot_cc = Command('snapshot.cc', [], [])
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot])
 
 
 (library_objs, d8_objs, mksnapshot) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot')