Added negative test for zeroing predicate

Author: Lukacma

llvm/test/MC/AArch64/SVE2/bfscale-diagnostics.s

@@ -33,4 +33,11 @@ bfscale z31.h, p8/m, z31.h, z31.h
 bfscale z31.h, p7/m, z20.h, z31.h
 // CHECK: [[@LINE-1]]:{{[0-9]+}}: error: operand must match destination register
 // CHECK-NEXT: bfscale z31.h, p7/m, z20.h, z31.h
-// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}:
+
+// ------------------------------------------------------------------------- //
+// Using zeroing predicate
+bfscale z0.h, p0/z, z0.h, z0.h
+// CHECK: [[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+// CHECK-NEXT: bfscale z0.h, p0/z, z0.h, z0.h
+// CHECK-NOT: [[@LINE-1]]:{{[0-9]+}}: