[PATCH] Fortran: fix IS_CONTIGUOUS for polymorphic dummy arguments [PR114001]

[Harald Anlauf]

Dear all,

here's another small fix: IS_CONTIGUOUS did erroneously always
return .true. for CLASS dummy arguments.  The solution was to
adjust the logic in gfc_is_simply_contiguous to also handle
CLASS symbols.

Regtested on x86_64-pc-linux-gnu.  OK for mainline?

Thanks,
Harald

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