[GWP-ASan] Add mutexes for Fuchsia am: 6e469b1c55 am: 0decae2d2b am: dc1770ed83

Original change: https://android-review.googlesource.com/c/platform/external/gwp_asan/+/1506411

Change-Id: I544324ed221552a7a583d58f44f0e19f4b653636