Fixed a bug where when an address is out of range mem_range was returning a non-null pointer which lead to simulator crashes.
Fixed a bug where when an address is out of range mem_range was returning a
non-null pointer which lead to simulator crashes.

And, fixed loadb and storeb to actually load and store bytes.



git-svn-id: 2a42d4147853adcf1a20d13614e77797555e50d1@36 d0763410-cf01-4c7c-9b55-0f7f3399ec47

rthelen/arm-sim,rthelen/arm-sim,rthelen/arm-sim