[patch, libfortran] Fix part of PR 36886

[Thomas Koenig]

Hello world,

this fixes PR 36886 for cshift0; currently regression-testing on
i686-pc-linux-gnu.  There is no ABI change with this patch.

Because of a piece of optimization included in this patch, where
complex cshift functions are used for the correct size and alignemnt, I
have also included a test case where the integer constants correspond to
NaNs, to catch any architecture where this could be problematic.


OK if regression-tets passes?

	Thomas
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