rs6000: vec-rotate-*.c fixes

This fixes two minor problems with the new testcases.  The first is
that almost all other tests, including all vec* tests, for powerpc use
names with dashes, not underscores.  The more important one is the the
vec-rotate-1.c and vec-rotate-3.c tests need the -maltivec flag.


gcc/testsuite/
	* gcc.target/powerpc/vec_rotate-1.c: Rename to ...
	* gcc.target/powerpc/vec-rotate-1.c: ... this.  Add -maltivec option.
	* gcc.target/powerpc/vec_rotate-2.c: Rename to ...
	* gcc.target/powerpc/vec-rotate-2.c: ... this.
	* gcc.target/powerpc/vec_rotate-3.c: Rename to ...
	* gcc.target/powerpc/vec-rotate-3.c: ... this.  Add -maltivec option.
	* gcc.target/powerpc/vec_rotate-4.c: Rename to ...
	* gcc.target/powerpc/vec-rotate-4.c: ... this.

From-SVN: r274239

gcc/testsuite/ChangeLog

+2019-08-09  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* gcc.target/powerpc/vec_rotate-1.c: Rename to ...
+	* gcc.target/powerpc/vec-rotate-1.c: ... this.  Add -maltivec option.
+	* gcc.target/powerpc/vec_rotate-2.c: Rename to ...
+	* gcc.target/powerpc/vec-rotate-2.c: ... this.
+	* gcc.target/powerpc/vec_rotate-3.c: Rename to ...
+	* gcc.target/powerpc/vec-rotate-3.c: ... this.  Add -maltivec option.
+	* gcc.target/powerpc/vec_rotate-4.c: Rename to ...
+	* gcc.target/powerpc/vec-rotate-4.c: ... this.
+
 2019-08-09  Sam Tebbs <sam.tebbs@arm.com>
 
 	* lib/target-supports.exp

gcc/testsuite/gcc.target/powerpc/vec_rotate-1.c → gcc/testsuite/gcc.target/powerpc/vec-rotate-1.c

-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -maltivec" } */
 /* { dg-require-effective-target powerpc_altivec_ok } */
 
 /* Check vectorizer can exploit vector rotation instructions on Power, mainly

gcc/testsuite/gcc.target/powerpc/vec_rotate-3.c → gcc/testsuite/gcc.target/powerpc/vec-rotate-3.c

-/* { dg-options "-O3" } */
+/* { dg-options "-O3 -maltivec" } */
 /* { dg-require-effective-target powerpc_altivec_ok } */
 
 /* Check vectorizer can exploit vector rotation instructions on Power, mainly