Fix outlining

• Fix how predecessors of the top node in the caller are calculated, only include predecessors that are not going to be outlined into the callee
• Came up when trying to run outlining on fac - maybe we should make it so individual test can specify custom pass orders so that we can track regressions more easily?

requested review from @aaronjc4

assigned to @rarbore2

merged

mentioned in commit bbb227d1