Turn on Ramiro's code to stack-trace and suspend when we crash, for DEBUG builds. b=14989 r=bryner sr=brendan

xpfe/bootstrap/nsSigHandlers.cpp

@@ -78,8 +78,7 @@ extern "C" char * strsignal(int);
 
 static char _progname[1024] = "huh?";
 
-//#if defined(LINUX) && defined(DEBUG) && (defined(__i386) || defined(PPC))
-#if 0
+#if defined(LINUX) && defined(DEBUG) && (defined(__i386) || defined(PPC))
 #define CRAWL_STACK_ON_SIGSEGV
 #endif