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  1. JDK
  2. JDK-8311866

[Lilliput/JDK17] Disallow accessing oop metadata vmStructs with +UCOH

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      Allowing external tools to access e.g. `oopDesc::_metadata._klass` with `+UCOH` is error-prone. We have seen async-profiler poking into this field to resolve classes:
       
      https://github.com/async-profiler/async-profiler/blob/117594bb4d1ce61b073c8a9cea438b33f3f09c81/src/vmStructs.cpp#L158-L161

            shade Aleksey Shipilev
            shade Aleksey Shipilev
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