[PATCH] Fortran: do not evaluate arguments of MAXVAL/MINVAL too often [PR118613]

[Harald Anlauf]

Dear all,

while looking at details of a related but slightly different PR, I found
that we did evaluate the arguments to MINLOC/MAXLOC too often in the
inlined version.

The attached patch creates temporaries for array elements where needed,
and ensures that each array element is only touched once.  This required
a minor adjustment for the rank-1 algorithm, which is documented.

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

Thanks,
Harald

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