[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
GitOrigin-RevId: 6d94eeadd28af4d488b5875778a3ebfa0d749b52
2 files changed
