[fortran,patch] Volatile variable in commons and equivalence groups

[FX]

Thanks for the review! And as for the testcase:

>> will come with a testcase
>> (based on -O3 simplification and scanning of the optimized tree dump,
>> like is done in the PR).
>
> However, you really should add a test case for this. See
> gfortran.dg/volatile*.f90 and the PR to this bug (PR 35037) for examples.

;-)

-- 
FX Coudert
http://www.homepages.ucl.ac.uk/~uccafco/