[SystemZ] vec-perm-14.ll - partially regenerate checks so we can see all the vperm codegen

We can't use the script as we need to keep the shuffle mask constant pool checks, but do more than just check that a second vperm isn't generated

Author: RKSimon

llvm/test/CodeGen/SystemZ/vec-perm-14.ll

@@ -4,8 +4,23 @@
 
 define void @fun() {
 ; CHECK-LABEL: fun:
-; CHECK: vperm
-; CHECK-NOT: vperm
+; CHECK:       # %bb.0: # %bb
+; CHECK-NEXT:    vlrepf %v0, 0(%r1)
+; CHECK-NEXT:    vgbm %v1, 0
+; CHECK-NEXT:    larl %r1, .LCPI0_0
+; CHECK-NEXT:    vceqb %v0, %v0, %v1
+; CHECK-NEXT:    vl %v1, 0(%r1), 3
+; CHECK-NEXT:    vperm %v0, %v0, %v0, %v1
+; CHECK-NEXT:    vlgvf %r0, %v0, 0
+; CHECK-NEXT:    tmll %r0, 1
+; CHECK-NEXT:    je .LBB0_2
+; CHECK-NEXT:  # %bb.1: # %bb1
+; CHECK-NEXT:  .LBB0_2: # %bb2
+; CHECK-NEXT:    vlgvf %r0, %v0, 1
+; CHECK-NEXT:    tmll %r0, 1
+; CHECK-NEXT:    je .LBB0_4
+; CHECK-NEXT:  # %bb.3: # %bb3
+; CHECK-NEXT:  .LBB0_4: # %bb4
 bb:
   %tmp = load <4 x i8>, ptr undef
   %tmp1 = icmp eq <4 x i8> zeroinitializer, %tmp