Be more agressive in flusing the cache. In addition to flushing the

instruction cache, also purge TLB entries.  The PA-RISC 2.0
architecture says that cache lines may be moved in when a translation
exists even if no access is done.  This might have been hurting us
badly since we create illegal aliases in pmap_zero_page() and
pmap_copy_page().

Probably not perfect yet, and perhaps a bit of a sledgehammer, but it
makes PA-RISC 2.0 machines stable again.

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