[Bug target/79671] [7 Regression] mapnik miscompilation on armv7hl since r235622

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671

--- Comment #22 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to Jakub Jelinek from comment #20)
> which fails also on x86_64-linux at -O2.  And that testcase regressed with
> r223126.  Now whether this is valid C++, no idea, placement new is messy.

This test case can't be valid, suppose the A has a copy constructor
that that is also not called when B is moved around.