[phobos] readlnImpl (Again)

[David Simcha]

I've begun to realize that Steve's array stomping patch breaks some
assumptions that std.stdio.readlnImpl made about how array appending works,
leading to it being slower than molasses again.  Should I just put some
assumeSafeAppend() calls in there to make it behave as it used to, even
though the old behavior was unsafe, or do we want to completely redesign
this code now that we want to guarantee no stomping?
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