trace: reimplement the DTRACE function so it doesn't use a vector

At the same time, rename the trace flags to debug flags since they
have broader usage than simply tracing.  This means that
--trace-flags is now --debug-flags and --trace-help is now --debug-help

src/dev/alpha/backdoor.cc

@@ -44,6 +44,7 @@
 #include "base/trace.hh"
 #include "cpu/base.hh"
 #include "cpu/thread_context.hh"
+#include "debug/AlphaBackdoor.hh"
 #include "dev/alpha/backdoor.hh"
 #include "dev/platform.hh"
 #include "dev/simple_disk.hh"

src/dev/alpha/tsunami_cchip.cc

@@ -42,6 +42,8 @@
 #include "config/the_isa.hh"
 #include "cpu/intr_control.hh"
 #include "cpu/thread_context.hh"
+#include "debug/IPI.hh"
+#include "debug/Tsunami.hh"
 #include "dev/alpha/tsunami.hh"
 #include "dev/alpha/tsunami_cchip.hh"
 #include "dev/alpha/tsunamireg.h"

src/dev/alpha/tsunami_io.cc

@@ -43,6 +43,7 @@
 #include "base/time.hh"
 #include "base/trace.hh"
 #include "config/the_isa.hh"
+#include "debug/Tsunami.hh"
 #include "dev/alpha/tsunami.hh"
 #include "dev/alpha/tsunami_cchip.hh"
 #include "dev/alpha/tsunami_io.hh"

src/dev/alpha/tsunami_pchip.cc

@@ -39,6 +39,7 @@
 
 #include "base/trace.hh"
 #include "config/the_isa.hh"
+#include "debug/Tsunami.hh"
 #include "dev/alpha/tsunami.hh"
 #include "dev/alpha/tsunami_pchip.hh"
 #include "dev/alpha/tsunamireg.h"