base: Output link to common errors page

This change adds a link to the common errors page that outputs
whenever a fatal signal is raised, showing when the program
aborts or segfaults.

Change-Id: I88420a594423570af670b460cfce7c03c4208120
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/70978
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>

src/sim/init_signals.cc

@@ -103,6 +103,8 @@ raiseFatalSignal(int signo)
     // The signal handler should have been reset and unmasked (it was
     // registered with SA_RESETHAND | SA_NODEFER), just raise the
     // signal again to invoke the default handler.
+    STATIC_ERR("For more info on how to address this issue, please visit "
+        "https://www.gem5.org/documentation/general_docs/common-errors/ \n\n");
     pthread_kill(pthread_self(), signo);
 
     // Something is really wrong if the process is alive at this