misc: Replace M5_CLASS_VAR_USED with GEM5_CLASS_VAR_USED.

Change-Id: Ibd2230d684f41201b07fa9083881145e36176a68
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45241
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>

src/cpu/o3/scoreboard.hh

@@ -58,7 +58,7 @@ class Scoreboard
     std::vector<bool> regScoreBoard;
 
     /** The number of actual physical registers */
-    M5_CLASS_VAR_USED unsigned numPhysRegs;
+    GEM5_CLASS_VAR_USED unsigned numPhysRegs;
 
   public:
     /** Constructs a scoreboard.

src/dev/arm/smmu_v3_transl.hh

@@ -97,7 +97,7 @@ class SMMUTranslationProcess : public SMMUProcess
     TranslContext context;
 
     Tick recvTick;
-    M5_CLASS_VAR_USED Tick faultTick;
+    GEM5_CLASS_VAR_USED Tick faultTick;
 
     virtual void main(Yield &yield);
 

src/mem/mem_interface.hh

@@ -140,7 +140,7 @@ class MemInterface : public AbstractMemory
     /**
      * General timing requirements
      */
-    M5_CLASS_VAR_USED const Tick tCK;
+    GEM5_CLASS_VAR_USED const Tick tCK;
     const Tick tCS;
     const Tick tBURST;
     const Tick tRTW;

src/mem/ruby/network/garnet/OutputUnit.hh

@@ -99,7 +99,7 @@ class OutputUnit : public Consumer
 
   private:
     Router *m_router;
-    M5_CLASS_VAR_USED int m_id;
+    GEM5_CLASS_VAR_USED int m_id;
     PortDirection m_direction;
     int m_vc_per_vnet;
     NetworkLink *m_out_link;

src/sim/probe/probe.hh

@@ -155,7 +155,7 @@ class ProbeManager
 {
   private:
     /** Required for sensible debug messages.*/
-    M5_CLASS_VAR_USED const SimObject *object;
+    GEM5_CLASS_VAR_USED const SimObject *object;
     /** Vector for name look-up. */
     std::vector<ProbePoint *> points;