Oops, a monster might be hit with a mutation attack or a Polymorph Other beam

while MF_JUST_SUMMONED is still set, so handle polymorphing just-placed shifters slightly differently.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8695 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 22, 2009
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