The `clang-scan-deps` tool can be used for fast scanning of batches of compilation commands passed in via the `-compilation-database` option. This gets awkward in our tests where we have to resort to using `.in`/`.template` JSON files and running them through `sed` in order to embed LIT's `%t` variable into them. However, most of our tests only need to pass single compilation command, so this dance is entirely unnecessary. This patch makes sure the existing "per-file" mode (where the compilation command is passed in-line after the `--` argument) works for all output formats, not only `P1689`.
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