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rts: Post ticky entry counts to the eventlog

Ben Gamari requested to merge wip/ticky-eventlog into master

The ticky-ticky profiler is a useful tool but provides little in the way of temporal resolution. In particular, benchmarks of the non-moving garbage collector has revealed what I believe to be a thunk leak in GHC when compiling Cabal's LicenseId module that I believe the ticky profiler would pin-point with temporal resolution.

This patch provides said resolution by giving the RTS the ability to periodically record samples of ticky counters to the eventlog.

Edited by Ben Gamari

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