Enable assertions and debugging code in the release...

src/SConscript

Index: src/SConscript
===================================================================
--- src/SConscript	(revision 3745)
+++ src/SConscript	(working copy)
@@ -104,6 +104,10 @@
     version.cc
     virtual-frame.cc
     zone.cc
+
+    objects-debug.cc
+    prettyprinter.cc
+    regexp-macro-assembler-tracer.cc
     """),
   'arch:arm': Split("""
     arm/builtins-arm.cc
@@ -171,9 +175,7 @@
   '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': []
 }