[commit] make step_1 use step_once

[Pedro Alves]

Hi guys,

This makes step_1 use step_once in the sync case as well to reduce
code (and logic) duplication.

I found out when moving patches between trees here that I was doing
essentially what Daniel had already done in his pending inline frame
support patch set, so I split and merged both.  Any new bug is
of course credited to yours truly.  Daniel, I hope you don't mind me
doing this.

Tested on x86-64-unknown-linux-gnu sync/async, and checked in.

-- 
Pedro Alves
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