CMK_TIMER_USE_PPC64 inaccurate with variable clock speeds
The pami-linux-ppc64le machine layer is defaulting to CMK_TIMER_USE_PPC64
src/arch/pami-linux-ppc64le/conv-mach.h:#define CMK_TIMER_USE_PPC64 1
This timer assumes a constant clock speed, which hasn't been true for a long time so projections traces are pretty useless.
Fix the code to do what's necessary to get accurate wall times from the fast intrinsic techniques.