Due to an improvement to name preservation, a lot of InstCombine
tests now show spurious diffs when regenerated.
Rather than regenerating individual files when they get touched,
mass-regenerate all UTC-based InstCombine tests. I have then reset
a number of files showing suspicious diffs where the UTC output
has clearly been manually adjusted. I apologize if I missed
anything in the mass of changes.
One of these two changes is exposing (or causing) some more miscompiles.
A reproducer is in progress, so reverting until resolved.
This reverts commit 9ddff66d0c9c3e18d56e6b20aa26a2a8cdfb6d2b.
