This is required for Delphi compatibility as implementers of IVarInvokable or
  inheritors of TInvokableVariantType need to modify the variant data by using
  a pointer to the TVarData because it's passed as const and thus not modifyable
  by itself.
  This behavior is documented in so far as the C++ builder documentation shows
  that the same parameter is implemented as "const&".

git-svn-id: trunk@48478 -