[PATCH] D39114: [XRay][darwin] Initial XRay in Darwin Support

[Dean Michael Berris via Phabricator via cfe-commits]

dberris planned changes to this revision.
dberris added a comment.

The FDR mode calls to `clock_gettime` needs a bit more attention, let me try and isolate those before attempting to land again.


https://reviews.llvm.org/D39114