[Bug tree-optimization/63748] [4.9/5 Regression] may be used uninitialized warning on variable definition with initializer

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63748

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is hard warning to avoid in the compiler as we don't know if foo
calls longjmp or not.  Note we don't know if alloc_jmp_buf does a push
somewhere else.