[patch, fortran] Fix PR 85896, type confusion with min and max

[Thomas Koenig]

Hello world,

the attached patchlet fixes a rejects-valid bug by simply ignoring the
type for max and min during simplification.  This is correct
because setting the type of a generic intrinsic function has
no effect.

It is a rare pleasure to fix a bug by removing code only :-)

Regression-tested. OK for trunk?

Regards

	Thomas

2018-10-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/85896
	* simplify.c (simplify_min_max): Do not convert the type of the
	return expression.

2018-10-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/85896
	* gfortran.dg/min_max_type.f90: New test.
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