Matt Arsenault 9c8b89f580 llvm-reduce: Refine missing argument behavior ...

We required the test and input arguments for --print-delta-passes
which is unhelpful. Also, start printing the help output if no
arguments were supplied.

It looks like there's more sophisticated ways to accomplish this with
the opt library, but it was less work to manually emit these errors.

2023-01-03 16:01:36 -05:00

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