A bug in pctr driver

[Sami]

Hello! I encountered a problem (kernel trap) when I was installing 
OpenBSD 6.0 to an old computer that has AMD AM486DX2 as a CPU. OpenBSD 
5.9 works fine. When I compiled the kernel with GENERIC config but only 
the pctr driver commented out from the config file, I managed to get the 
486 machine working using that newly compiled kernel. I think that the 
problem is probably in pctr.c in line #86, where it seems to call CPUID 
without checking first that the CPU supports it.