* MIPS: use correct def to calculate parameter alignment (when parameter is passed by address, its def changes to pointer and the alignment of parameter itself is irrelevant). Fixes at least webtbs/tw7806.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23538 3ad0048d-3df7-0310-abae-a5850022a9f2