Fix Issue 11861 (#11886)

Fix Issue 11861 (#11886)

* Fix issues exposed by building with MSVC and /permissive-.

Using full-qualified name to declare members inside class is ill-formed and incorrectly allowed by MSVC.
MSVC now gives error when /permissive- is used.

* Add a forward declaration for SafeAddRef from utilcode.h.
SafeAddRef in holder.h calls SafeAddRef in utilcode.h. The latter hasn't been declared yet, so it isn't a valid candidate during overload resolution.
It happens to work in MSVC default mode because of the lack of two phase name lookup.