[PATCH c/middle-end] Replace vector_opaque_p with a bit in the type

[Paolo Bonzini]

Paolo Bonzini wrote:
> I think I've already posted the patch, but it never was committed.
> Since these types are never created by the user (e.g. with attributes),
> it makes less sense in my opinion to use a target hook than for
> TARGET_MS_BITFIELD_TYPE_P.
> 
> Ok for 4.5?

Fixed the changelog, and tested on powerpc-eabispe.  Bootstrap/regtest
on i686-pc-linux-gnu will run overnight.

Paolo
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