+ nf_addr_taken: it marks nodes which address is taken
+ check if tnodeflags is 4 bytes or less
* do not do cse on expressions which address is taken

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26713 3ad0048d-3df7-0310-abae-a5850022a9f2