the Branch Target Buffer of the BPRD bit changes.
* Enable Branch Prediction on the XScale by default.
* Don't invalidate the Branch Target Buffer explicitly. the i80200
manual (section 5.1, Branch Target Buffer Operation) notes that
manual software management of the BTB is unnecessary; it is flushed
implicitly when:
* processor resets
* FCSE process ID is written
* I-cache is invalidated
be13b85887