* check if the pointer is really assigned when trying to remove unneeded jumps

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25867 3ad0048d-3df7-0310-abae-a5850022a9f2
* get rid of unneeded 64 bit multiplications, it makes also for signed operations no difference if a calculation is carried out with 32 or 64 bit, if the result is casted to 32 bin again

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25868 3ad0048d-3df7-0310-abae-a5850022a9f2