[issue31415] Add -X option to show import time

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> Why global _PyTime_GetWinPerfCounterWithInfo() is needed at all? It seems to me that _PyTime_GetPerfCounterWithInfo() can be used instead. Smaller API is better.

I chose to expose _PyTime_GetWinPerfCounterWithInfo() to make my change as small as possible.

I didn't want to break the old time.clock() clock by mistake.

By the way, time.clock() is deprecated since Python 3.3. It's maybe time to drop it?

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