safe texture mode. One, don't hash the palette when it doesn't matter;
including it completely kills performance in the map mode, and I'm
pretty sure it's because the palette points to essentially random
memory. Two, include the address in the hash seed; this helps with an
issue related to the EFB and the main menu. Hopefully, these changes
together don't cause any regressions.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1878 8ced0084-cf51-0410-be5f-012b33b47a6e