Scheduler cleanups, 1/N

[Bernd Schmidt]

I have a number of patches that will be necessary for a new target. Some
of these can be applied now as cleanups, so I'm submit them now.

This changes the schedule_block main loop not to move instructions while
computing the schedule. Instead, we collect them in a VEC and modify the
RTL afterwards. The real motivation for this is to add support for
backtracking later.

Bootstrapped and tested on i686-linux. No changes in generated code on
any of my testcases.


Bernd
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