This reverts commit 81e7bdfe1b.
This is not true in non-loop canonicalized SIL. It is true in loop-canonicalized
SIL though. So I need to fix the test to avoid the assert.
I need this for loop-arc since I need to be able to analyze all "loop-exits"
when I just have the parent loop region. We are already computing this
information and throwing it away, so there should be no compile time impact.
(Headers first)
It has been generally agreed that we need to do this reorg, and now
seems like the perfect time. Some major pass reorganization is in the
works.
This does not have to be the final word on the matter. The consensus
among those working on the code is that it's much better than what we
had and a better starting point for future bike shedding.
Note that the previous organization was designed to allow separate
analysis and optimization libraries. It turns out this is an
artificial distinction and not an important goal.
