[PATCH] Don't copy objects with trivial, deleted copy ctors

[Richard Smith]

On Mon, May 12, 2014 at 5:09 PM, Reid Kleckner <rnk at google.com> wrote:

> Hm, this approach fails quickly when I try to compile some simple
> programs.  This program doesn't declare any special members:
> struct S { int a; };
> void foo(S s) { }
>

You should be able handle this by using hasTrivialCopyConstructor and
hasTrivialMoveConstructor to check if the class has a (possibly
not-yet-declared) trivial copy or move constructor, under the same
assumption you're already making (if there is a trivial operation that's
not yet declared, it would not be deleted).
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