[Patch, Fortran] PR 86830: [8/9 Regression] Contiguous array pointer function result not recognized as contiguous

[Janus Weil]

Hi all,

the attached patch fixes a rejects-valid regression, where a
type-bound procedure call was not correctly detected to have a
contiguous result. The patch is functionally identical with comment #2
in the PR, with a little bit of cleanup on top of it. It regtests
cleanly on x86_64-linux-gnu. Ok for trunk and gcc-8-branch?

Cheers,
Janus
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