Commit test case for PR 87644, which has fixed itself somehow.

2020-04-13  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/87644
	* gfortran.dg/variable_parameter.f90: New test.

gcc/testsuite/ChangeLog

+2020-04-13  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/87644
+	* gfortran.dg/variable_parameter.f90: New test.
+
 2020-04-13  Linus Koenig <link@sig-st.de>
 
 	PR fortran/94192

gcc/testsuite/gfortran.dg/variable_parameter.f90

+! { dg-do compile }
+! PR 87644 - this used to cause an ICE.
+! Test case by Matt Thompson.
+module test
+
+  implicit none
+  private
+  public :: get
+  
+contains
+
+  subroutine initialize()
+     integer :: parameters
+     parameters = get()
+  end subroutine initialize
+
+  function get() result(parameters)
+     integer :: parameters
+     parameters = 1
+  end function get
+
+end module test