Revert "Small optimizations for is_foo_ptr."
Revert "Small optimizations for is_foo_ptr."

Looks like it broke win32.

This reverts commit 1880c15da798dae10cde05af63cb74d2ec6135a8.

FROGGS/parrot,tewk/parrot-select,tkob/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,gagern/parrot,FROGGS/parrot,gagern/parrot,gitster/parrot,tewk/parrot-select,gagern/parrot,tewk/parrot-select,parrot/parrot,gagern/parrot,tkob/parrot,FROGGS/parrot,youprofit/parrot,youprofit/parrot,parrot/parrot,gagern/parrot,youprofit/parrot,tewk/parrot-select,parrot/parrot,FROGGS/parrot,gitster/parrot,youprofit/parrot,tkob/parrot,gagern/parrot,FROGGS/parrot,gitster/parrot,gitster/parrot,youprofit/parrot,FROGGS/parrot,gagern/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,gitster/parrot,parrot/parrot,tewk/parrot-select,youprofit/parrot,parrot/parrot,tkob/parrot,tewk/parrot-select,tewk/parrot-select,gitster/parrot,gitster/parrot,FROGGS/parrot,tkob/parrot