Commits on Aug 6, 2021

1. Fix ThreadLocal tracking behavior …

   - Before this change the trackAllValues behavior for ThreadLocal<SomeParticularType> was defined by the first instance of thread local to have its value set on the thread
     - This could lead to unpredictable memory leaks (where the value was improperly tracked even though it wasn't supposed to be) This reproduces as a memory leak with no other observable behavior
     - Or data loss, where the Values collection was missing entries.
   - Change the model so that ThreadLocal<T> trackAllValues behavior is properly defined by the exact ThreadLocal<T> instance in use
   - Implement by keeping track of the track all changes behavior within the IdManager
   
   Fixes dotnet#55796

   

   davidwrighton committed Aug 6, 2021
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