regalloc: switch to "simple" selector strategy in shaper.
regalloc: switch to "simple" selector strategy in shaper.

Switch to the "simple" selector strategy in shaper. This strategy "likely"
yields worse schedules, but there are termination problems with the other
strategy in certain corner cases.

Signed-off-by: Nico Reißmann <d8255cca0642bdc1e6f9b45da9cb618d308e389b@gmail.com>

phate/jive,phate/jive,phate/jive