[Patch, Fortran] FINAL (prep patches 2/5): Add internal STRIDE intrinsic

[Tobias Burnus]

The attached patch adds a new - internal only - intrinsic, STRIDE, which 
returns the stride of an array with array descriptor; for an "integer :: 
array(5,5)", the stride of dim=2 is 5.

This new intrinsic is only internally available and will be used by the 
finalization wrapper to handle noncontiguous arrays.

Build on x86-64-gnu-linux.
OK for the trunk?

Tobias
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