[regalloc] Unify the way registers are chosen
With this change, we use the same heuristics for picking free registers and for picking a blocked register to spill. This is mostly cleanup to make results less surprising. Change-Id: I09d031c758ffbd02798d573bc9e68a474e916418 Reviewed-on: https://chromium-review.googlesource.com/c/1411607 Commit-Queue: Stephan Herhut <herhut@chromium.org> Reviewed-by: Sigurd Schneider <sigurds@chromium.org> Cr-Commit-Position: refs/heads/master@{#58948}
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