bloat check: make more robust

The use of 'C^' (parent) in 'git rebase' is counterintuitive,
at least to me: when C is a merge of multiple commits, rebase
picks each of those commits. That probably makes good sense
to a git expert, which I'm not.

Solution: forget using '^', just calculate the baseline sizes
by doing a checkout of the PR's parent.

Also: compute PR parent using git-merge-base instead of
blindly trusting $DEST_BRANCH (which may be volatile as
other PRs are merged).

Also: run git-rebase directly, not via make rule. That
indirection is too confusing here.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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