rebase: don't call rewriteutil.precheck() with to-be-skipped commits
It's clearly incorrect to call `rewriteutil.precheck()` for commits
that we're not about to rewrite. We haven't noticed yet because the
function doesn't check for divergence, but I'm about to teach it to do
that.
Differential Revision: https://phab.mercurial-scm.org/D10259
[workspace]
members = ["hg-core", "hg-cpython", "rhg"]
exclude = ["chg", "hgcli"]