add –allow-unused-prefixes.
This test has two runs that differ in what functions are left after the inliner,
for example: barney exists on OLDPM path but don’t exist on NEWPM path.
I restored prefixes this test had had after automatic checks were introduced
for this test.
For now there are no checks left for ALL_NEWPM path, but the behavior seem to
change over time so I added –allow-unused-prefixes to ease following check updates.
Renamed %tmp => %temp IR values to avoid update warning.
Differential revision: https://reviews.llvm.org/D120207
152325d2f3