Intel XScale hwpmc(4) support.
This brings hwpmc(4) support for 2nd and 3rd generation XScale cores. Right now it's enabled by default to make sure we test this a bit. When the time comes it can be disabled by default. Tested on Gateworks boards.
A man page is coming.
Obtained from: //depot/user/rpaulo/xscalepmc/...
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