[llvm] [Timers] Add a flag to set a minimum timer value for printing (PR #139306)

[Hans Wennborg via llvm-commits]

https://github.com/zmodem commented:

This seems to duplicate the logic between `PrintQueuedTimers` and `printJSONValues`. Maybe the filtering could happen in `prepareToPrintList` instead?

But more generally, is this the most useful way of limiting the output size? It seems the output size with a certain timer cutoff could vary a lot depending on how long the compilation ran for example. Maybe a flag to only print the top-N timers would be more useful?

https://github.com/llvm/llvm-project/pull/139306