Skip test case on target which supports an ABI but we expect an error

Author: tdittr

tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.rs

@@ -1,3 +1,8 @@
+// The unsupported target error (E0570) does not trigger on aarch64 or arm targets
+// -> so we skip this test for them
+//@ ignore-aarch64
+//@ ignore-arm
+
 // gate-test-abi_c_cmse_nonsecure_call
 fn main() {
     let non_secure_function = unsafe {

tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr

@@ -1,5 +1,5 @@
 error[E0658]: C-cmse-nonsecure-call ABI is experimental and subject to change
-  --> $DIR/gate_test.rs:4:46
+  --> $DIR/gate_test.rs:9:46
    |
 LL |         core::mem::transmute::<usize, extern "C-cmse-nonsecure-call" fn(i32, i32, i32, i32) -> i32>(
    |                                              ^^^^^^^^^^^^^^^^^^^^^^^
@@ -9,7 +9,7 @@ LL |         core::mem::transmute::<usize, extern "C-cmse-nonsecure-call" fn(i32
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0570]: `"C-cmse-nonsecure-call"` is not a supported ABI for the current target
-  --> $DIR/gate_test.rs:4:39
+  --> $DIR/gate_test.rs:9:39
    |
 LL |         core::mem::transmute::<usize, extern "C-cmse-nonsecure-call" fn(i32, i32, i32, i32) -> i32>(
    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^