TestRawProfilerHookCallsGetAssemblyReferences fails due to callback not being called

In the TestRawProfilerHookCallsGetAssemblyReferences test, CLRIE expects to receive `ICorProfilerCallback6::GetAssemblyReferences` callback at least once, but this does not happen for some reason. The raw profiler for the test is calling `SetEventMask2(0, COR_PRF_HIGH_ADD_ASSEMBLY_REFERENCES)` and the mask setting does succeed.