[Bug middle-end/63774] wrong code at all optimization levels on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63774

--- Comment #2 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Andrew Pinski from comment #1)
> This code is undefined as you are returning an address of local variable.

Andrew, that's what I was unsure about and thus reported it.  Should it
actually be implementation defined?  Also, all previous versions of the
compiler seem to behave more as expected.