[Development] [BIC notice] QSharedPointer's internals devirtualised

[Thiago Macieira]

Hello

Changes https://codereview.qt-project.org/26974 and 26975 are introduce a 
binary-incompatible change to QSharedPointer. That affects *only* the 
internals, though those internals are exposed in inline code. Once these 
changes approved, I will stage them on a Friday, as code that is not 
recompiled will probably crash due to a change in the layout of the d pointer.

The change is fully source-compatible, though.

Those two changes fix a design flaw in QSharedPointer. The changes that follow 
are simply cleanups and optimisations.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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