Jonas Devlieghere 6d94eeadd2 [lldb] Ad os_signpost support to lldb_private::Timer ...

Emit os_signposts when supported from LLDB's timer class. A vast amount
of performance sensitive places in LLDB are already instrumented with
the Timer class.

By emitting signposts we can examine this information in Instruments. I
recommend looking at Daniel's differential for why this is so powerful:
https://reviews.llvm.org/D52954.

Differential revision: https://reviews.llvm.org/D93657

2021-01-06 15:16:09 -08:00

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