reasons explained in code, but I suggest turning it on and using oprofile if
you're looking at performance issues on Linux.
The build system change required is attached to issue 323... I would
have committed something for that, but I'm not really familiar with the
build system.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1246 8ced0084-cf51-0410-be5f-012b33b47a6e