[PATCH] D36847: [Support] Add reentrant start/stop Timer methods

[Brian Gesiak via Phabricator via llvm-commits]

modocache added a comment.

One downside of separate `startReentrantTimer` and `stopReentrantTimer` methods is that we may need to add a `bool IsReentrant` parameter to the initializer of `TimeRegion`, in order to support the way it's used in https://reviews.llvm.org/D36946.


https://reviews.llvm.org/D36847