Specialize std::hash for GpuProgramProfile

Source/BansheeCore/Include/BsGpuProgram.h

@@ -231,4 +231,19 @@ namespace BansheeEngine
 	};
 
 	/** @} */
-}
+}
+
+namespace std
+{
+/** Hash value generator for GpuProgramProfile. */
+template<>
+struct hash<BansheeEngine::GpuProgramProfile>
+{
+	size_t operator()(const BansheeEngine::GpuProgramProfile& profile) const
+	{
+		size_t hash = 0;
+		BansheeEngine::hash_combine(hash, (int)profile);
+		return hash;
+	}
+};
+}