[Patch, Fortran] PR fortran/45197: F2008: Allow IMPURE elemental procedures

[Daniel Kraft]

Hi,

the small patch attached implements the F2008 attribute IMPURE that may
be given to procedures; this may be used to get ELEMENTAL procedures
that are not also PURE (as is the default).

Instead of checking (attr.pure || attr.elemental) in gfc_pure, only
attr.pure is checked -- which seems also cleaner to me.  Instead,
attr.pure is set if ELEMENTAL but not IMPURE was parsed.

No regressions on GNU/Linux-x86-32.  Ok for trunk?

Daniel

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Done:  Arc-Bar-Cav-Ran-Rog-Sam-Tou-Val-Wiz
To go: Hea-Kni-Mon-Pri

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