Fix the dirty bit and make the register cache use it to be a bit more clever:

it skips storing a register back to memory if its value hasn't changed. 
This happens with stuff like compares and fast memory loads.

This is the first in a series of enhancements I have in my tree for the 
jit that I plan to commit over the next few hours.  I'm likely to 
cause some breakage, so if you see regrassions, please report them; if 
you can track them down to a specific revision, that would be very 
helpful.  I'm trying to make the changes small to allow pinpointing 
regressions more easily.



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@1252 8ced0084-cf51-0410-be5f-012b33b47a6e

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