D3D12: Fix rare case where command list was executed with open queries

Source/Core/VideoCommon/PerfQueryBase.h

@@ -31,22 +31,31 @@ class PerfQueryBase
 public:
   PerfQueryBase() : m_query_count(0) {}
   virtual ~PerfQueryBase() {}
+
   // Checks if performance queries are enabled in the gameini configuration.
   // NOTE: Called from CPU+GPU thread
   static bool ShouldEmulate();
 
   // Begin querying the specified value for the following host GPU commands
+  // The call to EnableQuery() should be placed immediately before the draw command, otherwise
+  // there is a risk of GPU resets if the query is left open and the buffer is submitted during
+  // resource binding (D3D12/Vulkan).
   virtual void EnableQuery(PerfQueryGroup type) {}
+
   // Stop querying the specified value for the following host GPU commands
   virtual void DisableQuery(PerfQueryGroup type) {}
+
   // Reset query counters to zero and drop any pending queries
   virtual void ResetQuery() {}
+
   // Return the measured value for the specified query type
   // NOTE: Called from CPU thread
   virtual u32 GetQueryResult(PerfQueryType type) { return 0; }
+
   // Request the value of any pending queries - causes a pipeline flush and thus should be used
   // carefully!
   virtual void FlushResults() {}
+
   // True if there are no further pending query results
   // NOTE: Called from CPU thread
   virtual bool IsFlushed() const { return true; }