Outbox eip1153 draft

[gvladika]

Update Outbox to use transient storage for L2 to L1 context

[gzeoneth]

we can also use tstore on this

nitro-contracts/src/bridge/AbsBridge.sol

Lines 217 to 225 in 76d541c

	address prevOutbox = _activeOutbox;
	_activeOutbox = msg.sender;
	// We set and reset active outbox around external call so activeOutbox remains valid during call
	// We use a low level call here since we want to bubble up whether it succeeded or failed to the caller
	// rather than reverting on failure as well as allow contract and non-contract calls
	(success, returnData) = _executeLowLevelCall(to, value, data);
	_activeOutbox = prevOutbox;

[gvladika]

we can also use tstore on this

nitro-contracts/src/bridge/AbsBridge.sol

Lines 217 to 225 in 76d541c

	address prevOutbox = _activeOutbox;
	_activeOutbox = msg.sender;
	// We set and reset active outbox around external call so activeOutbox remains valid during call
	// We use a low level call here since we want to bubble up whether it succeeded or failed to the caller
	// rather than reverting on failure as well as allow contract and non-contract calls
	(success, returnData) = _executeLowLevelCall(to, value, data);
	_activeOutbox = prevOutbox;

Added - 5a7b88c

Savings:

Gas diff compared to referent report:
depositEth: -216 (-0.34%)
withdrawEth_executeTransaction: -28508 (-40.58%)
withdrawToken_executeTransaction: -28093 (-21.58%)