tree 757902b578a95e5d8c8e27c7187fdabb494de026
parent 40244841f1a7e3970a89410e3a69b4f0f49e2df9
author Derek Mauro <dmauro@google.com> 1737146930 -0800
committer Copybara-Service <copybara-worker@google.com> 1737146978 -0800

Use absl::NoDestructor for some absl::Mutex instances in the flags
library to prevent some exit-time destructor warnings

This is the convention in the rest of Abseil.

PiperOrigin-RevId: 716767392
Change-Id: Ie7e1df54e79eba9057fbaeea000f63b6ec9929bc