swift234

REPL: Quick hack to enable better multi-line input history

Hitting 'up arrow' after an error does something far more reasonable now.

EXAMPLE:
	(swift) struct Foo {
			  var a:
			}
	<REPL Input>:2:9: error: expected type
	  var a:
			^
AFTER HITTING 'UP ARROW':
	(swift) struct Foo {
	var a:
	}

Swift SVN r12203