[Bug tree-optimization/69368] [6 Regression] spec2006 test case 416.gamess fails with the g++ 6.0 compiler starting with r232508

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69368

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Bet we shouldn't use get_ref_base_and_extent comparisons if there is a variable
ARRAY_REF index and the corresponding array is flexible array member or poor
man's flexible array member.