* powerpc64: removed references to global variables 'cg' (it is implicit 'self' in methods of tcg descendants) and 'current_asmdata.currasmlist' (the asmlist to use is passed as argument).

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27860 3ad0048d-3df7-0310-abae-a5850022a9f2