ARM: Thumb is an ugly mess, but this at least makes fcl-image package to build with -Ooregvar. someone with more clue is welcomed to review and come up with a better patch.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28534 3ad0048d-3df7-0310-abae-a5850022a9f2