[Bug tree-optimization/91020] Enhance SRA to deal with "omp simd array" variables

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91020

--- Comment #2 from Martin Jambor <jamborm at gcc dot gnu.org> ---
In the first example, even if we ignored the addressability, the
individual array items, which are structures, are copied whole:

D.2240[_27] = D.2241[_27]

This complicates detection when separation into distinct arrays of
scalars is legal, especially if there is any padding in the
structure.