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The TypeIDMap is stored in the AppDomain and contains two hash maps -
id to MethodTable and MethodTable to id. We were missing removing
entries for MethodTables that belong to a LoaderAllocator that's being
destroyed. Thus we were leaking some memory, but also causing potential
issue. When at some point after the LoaderAllocator destruction a
MethodTable gets the same address as one of the MethodTables that was
destroyed in the past and was also recorded in the TypeIDMap, we would
incorrectly reuse the id. That is problematic in case the old
MethodTable didn't require fat id and the new does or vice versa.
I've hit assert due to that while running System.Numerics.Vectors.Tests
inside an unloadable AssemblyLoadContext.
The implementation of the fix is very primitive. It is expected that we
will be able to get rid of the TypeIDMap in a near future and so it is
not worth optimizing.
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