testsuite, rs6000: Don't xfail Wtrampolines.c on -m32

This test does not fail with -m32, so we shouldn't xfail it there.


gcc/testsuite/
	* gcc.dg/Wtrampolines.c: Do the xfail for only 64-bit powerpc instead
	of all powerpc.

From-SVN: r245336

gcc/testsuite/ChangeLog

+2017-02-10  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* gcc.dg/Wtrampolines.c: Do the xfail for only 64-bit powerpc instead
+	of all powerpc.
+
 2017-02-10  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/79435

gcc/testsuite/gcc.dg/Wtrampolines.c

@@ -28,7 +28,7 @@ void foo (void)
 
   double a (int k, pfun x1, pfun x2, pfun x3, pfun x4, pfun x5)
   {
-    double b (void)  /* { dg-warning "trampoline generated for nested function 'b'" "standard descriptors" { xfail ia64-*-* powerpc64-*-* *-*-aix* } } */
+    double b (void)  /* { dg-warning "trampoline generated for nested function 'b'" "standard descriptors" { xfail { { ia64-*-* *-*-aix* } || { powerpc*-*-* && lp64 } } } } */
     { 
       k = k - 1;
       return a (k, b, x1, x2, x3, x4 );