Change the way execution results are collected.

Changes handling ExecutionResult by Executive. From now execution results are collected on if a storage for results (ExecutionResult) is provided to an Executiove instance up front. This change allow better output management for calls - VM interface improved.

libevmjit-cpp/JitVM.h

@@ -11,7 +11,7 @@ namespace eth
 class JitVM: public VMFace
 {
 public:
-	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp = {}, uint64_t _steps = (uint64_t)-1) override final;
+	virtual bytesConstRef execImpl(u256& io_gas, ExtVMFace& _ext, OnOpFunc const& _onOp, uint64_t _steps) override final;
 
 private:
 	jit::RuntimeData m_data;