Stricter implicit conversions between vectors, revised patch

[Gerald Pfeifer]

On Sat, 23 Dec 2006, Mark Shinwell wrote:
> These have now been sorted.  This patch has no regressions on
> x86_64-unknown-linux-gnu and powerpc64-unknown-linux-gnu.  OK to apply?

If/when this goes in, would you mind adding something to 
gcc-4.3/changes.html as well describing the stricter behavior
and the new option?

Thanks,
Gerald