In fact, it seems that in this configuration the third part of the PGO process, the (B) build job, does in fact do an artifact build, completely ignoring the results of (instr) and (run) jobs, see e.g. this log: https://firefoxci.taskcluster-artifacts.net/G07LNzNIS3-trJmIsXMVXA/0/public/logs/live_backing.log
Bug 1619966 Comment 4 Edit History
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In fact, it seems that in this configuration the third part of the PGO process, the (B) build job, does in fact do an artifact build, completely ignoring the results of (instr) and (run) jobs, see e.g. this log: https://firefoxci.taskcluster-artifacts.net/G07LNzNIS3-trJmIsXMVXA/0/public/logs/live_backing.log (from https://treeherder.mozilla.org/#/jobs?repo=try&revision=7bb0ade60dabb4a2b2426b2a0b5942bd86cf7c26&selectedJob=291686422 )