VTT clarification

[Mark Mitchell]

The VTT description is slightly confusing:

  - The description for `secondary virtual pointers' specifies which
    subobjects get secondary virtual pointers.  As written, it
    suggests that even secondary virtual pointers for primary base
    classes are included.

  - The note before the example says:

    secondary virtual pointers are present for all bases with either
    virtual bases or virtual function declarations overridden along a
    virtual path. The only exception is that a primary non-virtual
    base class does not require a secondary virtual pointer.

If there are not supposed to be secondary virtual pointers for primary
bases (and I think that there should not be), then that should go in
the description of secondary virtual pointers; the notes should be
informational, rather than normative.

--
Mark Mitchell                   mark at codesourcery.com
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