I am updating these because we didn't have test coverage for the
different handling of `fmt: skip` comments applied to multiple
statements on the same line. This is in preparation for #22119 (to show
before/after deviations).
Follows the same procedure as in #20794
Edit: As it happens, the new fixtures do not even cover the case
relevant to #22119 - they just deal with the already handled case of a
one-line compound statement. Nevertheless, it seems worthwhile to make
this update, especially since it uncovered a (possible?) bug.
924b2972f2