[compiler-rt][Fuzzer] Relax reduce_inputs.test to account for non-determinism (#182495) I have seen that very occasionally this test is failing on a bot, with only 3 files in the corpus. After running the test in a loop 4000+ times, I witnessed this same failure twice. In both cases the first corpus member was some string not containing a 'F'; the second corpus member was 'F[' or 'FZ'; and the final corpus member 'FUZ'. In a normal run there is an intermediate corpus member 'FU.' - so this test is failing in very rare cases where the fuzzer gets lucky and matches 2 branch conditions in one mutation. This patch allows the FileCheck condition to match 3 or 4 corpus files. It may be possible for the fuzzer to reach the target in 2 files, but I think that if that is possible, it will be exceptionally rare. rdar://170440934
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