Indy SC bug

[Ulf Carlsson <ulfc@thepuffingroup.com>]

Hi all,

I've found a silly bug in the R4600SC caching routines. It wiped the whole cache
at wrap arounds even if you just tried to write back two cache lines (for
example the last cache line and the first cache line).

I can't understand how this bug has lasted so long in the kernel. Well, now that
I've sorted it out, your R4600SC machine be A LOT faster.

- Ulf