Add optimizer setting for fuzzing.

libsolidity/interface/OptimiserSettings.h

@@ -149,6 +149,7 @@ struct OptimiserSettings
 	/// This specifies an estimate on how often each opcode in this assembly will be executed,
 	/// i.e. use a small value to optimise for size and a large value to optimise for runtime gas usage.
 	size_t expectedExecutionsPerDeployment = 200;
+	bool forceOldPipeline = false;
 };
 
 }