Fix deep-const-correctness of qGetPtrHelper() for smart pointers

The function qGetPtrHelper() is mainly used to implement d_func() within
the Q_DECLARE_PRIVATE() macro. The whole purpose of d_func() is to
propagate const deeply. But if a smart pointer implements this by itself,
then the old version of qGetPtrHelper(), by taking the Ptr as a const-&,
would always return a const payload pointer, which would fail in the
following reinterpret_cast in d_func() to mutable payloads.

This was found while experimenting with making QExplicitlySharedDataPointer
deep const-correct, and I have no explanation why it seems to have worked
with QSharedDataPointer, which is deep-const-correct already.

Change-Id: Iee2e8fcce89c58ba2af7818de6f79ed39c5a4030
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
 
 
 
 

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