[PATCH, ppc] Fix hw *points for embedded ppc in a threaded environment

[Luis Machado]

Hi,

This is an updated version of the patch i sent a while ago. It addresses 
Pedro's comments and hopefully is OK now.

I renamed the testcase to something more meaningful than watchthreads3.

If this doesn't delay the release, it would be nice to include it since 
it is an annoying issue for embedded ppc targets.

Regards,
Luis
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