Fix armjit fastmem

It was encoded wrong, this fixes the encoding and allows the reg-indexed case (which is supported.)

Google found me some fairly concise docs and the addressing modes:
http://www.rz.uni-karlsruhe.de/rz/docs/VTune/reference/Address_Miscellaneous_Loads_and_Stores_Overview.htm
http://www.rz.uni-karlsruhe.de/rz/docs/VTune/reference/Address_Load_and_Store_Word_or_Unsigned_Byte_Overview.htm

Also some tweaks to the CMakeLists.txt for iOS.  Still doesn't seem to pick up code changes without a make clean (even tried rm'ing ArmCompLoadStore.o, libCore.a, , and the .app, still doesn't take them, driving me nuts...)

-[Unknown]