This breaks looking for build output after finding valid output.
Otherwise build output with lower precedence can overwrite output
with higher precedence.

This also moves a static method.

Bug: chromium:1132088
Change-Id: I1824028243f964ab0956e54ca24921e6f32f2ca3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2440337
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70223}