rs6000, testcase: Add require-effective-target has_arch_ppc64 to pr10…

…6550_1.c

Hi,

With latest trunk, case pr106550_1.c can run with failure on ppc under -m32.
While, the case is testing 64bit constant building. So, "has_arch_ppc64"
is required.

Test pass on ppc64{,le}.

BR,
Jeff (Jiufu Guo)

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/pr106550_1.c: Add has_arch_ppc64 target require.

gcc/testsuite/gcc.target/powerpc/pr106550_1.c

@@ -1,5 +1,6 @@
 /* PR target/106550 */
 /* { dg-require-effective-target power10_ok } */
+/* { dg-require-effective-target has_arch_ppc64 } */
 /* { dg-options "-O2 -mdejagnu-cpu=power10 -fdisable-rtl-split1" } */
 /* force the constant splitter run after RA: -fdisable-rtl-split1.  */