compiler: don't add operator name as a function result into operator symtable. For FPC mode only operator result identifier should be added and for Delphi mode only 'Result' identifier. Fixes mantis #0025081

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25562 3ad0048d-3df7-0310-abae-a5850022a9f2