Revert removal of CPU time profiling in 29658-29661. Those 0's and 10's will add...

Revert removal of CPU time profiling in 29658-29661. Those 0's and 10's will add up to the correct guestimate reliably, as long as the decision as to which function gets the tick does not depend on the function. The variance of course will be larger, but it was pretty large to start with. Should fix breakage in report.py.