Silence '-Whsa' diagnostic in 'gfortran.dg/goacc/pr78027.f90'

... which has been present (with HSA offloading configured) ever since this
test case got added.

	gcc/testsuite/
	PR fortran/78027
	* gfortran.dg/goacc/pr78027.f90: Add 'dg-additional-options "-Wno-hsa"'.

From-SVN: r269103

gcc/testsuite/ChangeLog

+2019-02-22  Thomas Schwinge  <thomas@codesourcery.com>
+
+	PR fortran/78027
+	* gfortran.dg/goacc/pr78027.f90: Add 'dg-additional-options "-Wno-hsa"'.
+
 2019-02-22  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/87609

gcc/testsuite/gfortran.dg/goacc/pr78027.f90

 ! { dg-additional-options "-fopenmp -O2 -fdump-ipa-icf" }
 
+!     f951: warning: could not emit HSAIL for the function [-Whsa]
+!     f951: note: HSA does not support functions with variadic arguments (or unknown return type): 'GOACC_parallel_keyed'
+! { dg-additional-options "-Wno-hsa" }
+
 real function f()
    !$omp declare target(f)
    f = 1.