Commits on Mar 28, 2019

1. validation: fix deadlock in XrDestroyInstance …

   GenValidUsageNextXrDestroyInstance locks the non-recursive
   g_instance_dispatch_mutex and then calls GenValidUsageCleanUpMaps under the
   lock, which calls EraseAllInstanceTableMapElements, which tries to lock
   g_instance_dispatch_mutex again, causing a deadlock.
   Since EraseAllInstanceTableMapElements is only called from
   GenValidUsageNextXrDestroyInstance, g_instance_dispatch_mutex is always
   guaranteed to be locked, so drop the local std::unique_lock.

   

   pH5 committed Mar 28, 2019
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