cbits/cycles.c: Add support for Linux on non-Intel CPUs
cbits/cycles.c: Add support for Linux on non-Intel CPUs

Tested on armhf and powerpc.

iu-parfunc/criterion,bgamari/criterion,iu-parfunc/criterion,bos/criterion,bgamari/criterion,bos/criterion,bos/criterion,iu-parfunc/criterion,bgamari/criterion