This adds a new pass for dropping assumes that are unlikely to be useful
for further optimization.
It works by discarding any assumes whose affected values are one-use
(which implies that they are only used by the assume, i.e. ephemeral).
This pass currently runs at the start of the module optimization
pipeline, that is post-inline and post-link. Before that point, it is
more likely for previously "useless" assumes to become useful again,
e.g. because an additional user of the value is introduced after
inlining + CSE.
`-passes='default<O3>'` isn't correctly parsed on DOS, so when update_test_checks.py runs a system call on the opt RUN line, it fails to evaluate properly - use `-passes="default<O3>"` instead.
