mem-ruby: Add codes for pure virtual functions for compilation

Change-Id: Ic34f9ccf10ec28d68eed236dc6246e2ae2ef1b89
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28409
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>

src/mem/ruby/system/VIPERCoalescer.cc

@@ -76,6 +76,16 @@ VIPERCoalescer::~VIPERCoalescer()
 {
 }
 
+void
+VIPERCoalescer::issueRequest(CoalescedRequest* crequest)
+{
+}
+
+void
+VIPERCoalescer::issueMemSyncRequest(PacketPtr pkt)
+{
+}
+
 // Places an uncoalesced packet in uncoalescedTable. If the packet is a
 // special type (MemFence, scoping, etc), it is issued immediately.
 RequestStatus

src/mem/ruby/system/VIPERCoalescer.hh

@@ -57,6 +57,9 @@ class VIPERCoalescer : public GPUCoalescer
     typedef VIPERCoalescerParams Params;
     VIPERCoalescer(const Params *);
     ~VIPERCoalescer();
+
+    void issueMemSyncRequest(PacketPtr pkt);
+    void issueRequest(CoalescedRequest* crequest) override;
     void wbCallback(Addr address);
     void invCallback(Addr address);
     RequestStatus makeRequest(PacketPtr pkt);