[Bug target/58320] [4.7 / 4.8 / 4.9 Regression] code used in autoconf test fails with -O2, works with -O0

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58320

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Well, until the compiler comes along and inlines 'inner'.

This is really a GIGO test.