[PATCH] test: Block slp-16.c check for target support vect_strided6

[Juzhe-Zhong]

This testcase FAIL in RISC-V because RISC-V support vect_load_lanes with 6.
FAIL: gcc.dg/vect/slp-16.c -flto -ffat-lto-objects  scan-tree-dump-times vect 
"vectorizing stmts using SLP" 2
FAIL: gcc.dg/vect/slp-16.c scan-tree-dump-times vect "vectorizing stmts using 
SLP" 2

Since it use vlseg6 (vect_load_lanes with array size = 6)

gcc/testsuite/ChangeLog:

        * gcc.dg/vect/slp-16.c: Block vect_strided6.
        * lib/target-supports.exp: Add strided type.

---
 gcc/testsuite/gcc.dg/vect/slp-16.c    | 2 +-
 gcc/testsuite/lib/target-supports.exp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/vect/slp-16.c 
b/gcc/testsuite/gcc.dg/vect/slp-16.c
index d053a64276d..44ba730bda8 100644
--- a/gcc/testsuite/gcc.dg/vect/slp-16.c
+++ b/gcc/testsuite/gcc.dg/vect/slp-16.c
@@ -67,5 +67,5 @@ int main (void)
 }
 
 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect"  { target 
vect_int_mult } } } */
-/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 2 "vect" { 
target vect_int_mult } } } */
+/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 2 "vect" { 
target { vect_int_mult && {! vect_strided6 } } } } } */
   
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index edaa010258f..2de41cef2f6 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -8621,7 +8621,7 @@ proc check_effective_target_vect_interleave { } {
                 && [check_effective_target_s390_vx]) }}]
 }
 
-foreach N {2 3 4 8} {
+foreach N {2 3 4 5 6 7 8} {
     eval [string map [list N $N] {
        # Return 1 if the target supports 2-vector interleaving
        proc check_effective_target_vect_stridedN { } {
-- 
2.36.3