[ARM] Function pointer comparisons with app pc are not all converting LSB

I just hit a detach bug on ARM where it compares the app pc of 0x33288 to the function pointer for dr_app_stop_and_cleanup 0x33289: the latter is decorated with the LSB for Thumb while the former is normalized for decoding.
```
is_stopping_point: pc=0x00033288 vs 0x00033289
```

I suspect there are other instances like this so I'm filing this to audit the code.