Re: [cxx-conversion] Convert vec.[ch] to C++ [1/3] (issue6233044)

[Diego Novillo]

I have committed these three patches as a single revision r187836 on 
cxx-conversion.

I will address further comments to the patch in subsequent changes.
Andrew, if you have some time, could you see if you can recreate that 
LTO aliasing failure you were describing earlier?

I may change the data structure again, but it would still be interesting 
to have a test for it.


Thanks.  Diego.