monsters::upgrade_type(), as it's more accurate, allow it to adjust HD as well as HP, and do the latter when promoting to a priest, to make sure that it ends up with the proper HD.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3860 c06c8d41-db1a-0410-9941-cceddc491573
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