Richard Smith 6ae0e6d5fb Don't crash when given an empty input filename. (#184718) ...

Commands such as `clang -- ''` hit two different crash bugs: a buffer
overflow caused by using a `memcmp` that might be larger than the input,
and a bogus assert in the option parser when attempting typo correction.

2026-03-05 12:50:03 -08:00

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