* Handle assigned(x) expressions entirely in first pass by converting them to "x<>nil", indicate that procedure variables should not be called by setting nf_load_procvar flag (which is already used with typeconvnode for exactly the same purpose). This allows to generate better code when assigned(x) is used on right side of assigments. Mantis #24572.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25499 3ad0048d-3df7-0310-abae-a5850022a9f2