testsuite: Adjust scalar-test-data-class-1[45].c with int128

Test cases scalar-test-data-class-1[45].c adopts type __int128
which requires to check int128 effective target, otherwise the
testing on them will fail at -m32.  This patch is to add int128
effective target requirement.

gcc/testsuite/ChangeLog:

	* gcc.target/powerpc/bfp/scalar-test-data-class-14.c: Adjust with
	int128 effective target requirement.
	* gcc.target/powerpc/bfp/scalar-test-data-class-15.c: Likewise.

gcc/testsuite/gcc.target/powerpc/bfp/scalar-test-data-class-14.c

 /* { dg-do run { target { powerpc*-*-* } } } */
+/* { dg-require-effective-target int128 } */
 /* { dg-require-effective-target p9vector_hw } */
 /* { dg-options "-mdejagnu-cpu=power9" } */
 

gcc/testsuite/gcc.target/powerpc/bfp/scalar-test-data-class-15.c

 /* { dg-do run { target { powerpc*-*-* } } } */
+/* { dg-require-effective-target int128 } */
 /* { dg-require-effective-target p9vector_hw } */
 /* { dg-options "-mdejagnu-cpu=power9" } */