cvise: explicitly point to `clang-format`

Without the cnage `cvise` fails to normalize sources with
`clang-format` and produces less than ideal intermediate sources to
lines-based pass. That affects reduction speed among other things.

Before the change `cvise` complained as:

    $ cvise --command 'grep foo a.c' a.c
    00:00:00 INFO Using temporary interestingness test: /tmp/tmp4a_4wut0.sh
    00:00:00 ERROR cannot find external program clang-format
    00:00:00 ERROR Prereqs not found for pass IndentPass::regular

After the change `clang-format` is found:

    $ result/bin/cvise --command 'grep foo a.c' a.c
    00:00:00 INFO Using temporary interestingness test: /tmp/tmpudipespb.sh
    00:00:00 INFO ===< 1539388 >===

While at it used `--replace-fail`.

0 files changed, 0 insertions, 0 deletions