VTT example

[Mark Mitchell]

Folks --

  Alex and I have concluded that the VTT example in the ABI document
is wrong.  It claims that V1 is a primary base, but since V1 is
virtual and not nearly-empty, this is not true.  We think the correct
VTT layout is:

VTT for D:		D
  VTT for C1-in-D:	C1-in-D 
  VTT for C2-in-D: 	C2-in-D
    Seccondary vptrs:	V2-in-D
	                V1-in-D 
  Secondary vptrs:	C2-in-D
		        V1-in-D 
			V2-in-D 
  Virtual VTT for V1:   V1-in-D 
  Virtual VTT for V2:   V2-in-D 
    Secondary vptrs:    V1-in-D 

--
Mark Mitchell                   mark at codesourcery.com
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