Failure in the Exceptions smoke test with CFG

[MichalStrehovsky]

When running the Exceptions test with CFG, control flow guard kills the process when we try to call RhpInitialInterfaceDispatch. We need to investigate what's going on. This method is address taken in the native runtime so it should be added to the bitmask by the C++ compiler. Also it's suspicious interface dispatch would be broken when we run ILC in the CI with CFG enabled.

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