C++ PATCH to initializer-list overload resolution

[Paolo Carlini]

Jason Merrill wrote:
> Paolo's message with is patch for library DR 630 noted that assigning
> { } to a valarray was using the element assignment op rather than the
> initializer-list version.  Which is wrong; we always want to prefer
> the initializer-list overload when we get { }.  I had implemented that
> for comparison to calling a constructor, but not for conversion to
> scalar type.  Fixed thus.
Many thanks Jason. I also applied the below (per my original intentions ;)

Paolo.

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