ignore code blocks in unused error message code

Author: folkertdev

compiler/rustc_error_codes/src/error_codes/E0775.md

@@ -3,7 +3,7 @@ extension.
 
 Erroneous code example:
 
-```compile_fail,E0775
+```ignore (no longer emitted)
 #![feature(cmse_nonsecure_entry)]
 
 pub extern "C-cmse-nonsecure-entry" fn entry_function() {}

compiler/rustc_error_codes/src/error_codes/E0776.md

@@ -4,7 +4,7 @@
 
 Erroneous code example:
 
-```
+```ignore (no longer emitted)
 #![feature(cmse_nonsecure_entry)]
 
 #[no_mangle]

tests/ui/cmse-nonsecure/cmse-nonsecure-entry/params-on-registers.rs

@@ -1,15 +1,22 @@
-//@ build-pass
 //@ compile-flags: --target thumbv8m.main-none-eabi --crate-type lib
 //@ needs-llvm-components: arm
+//@ assembly-output: emit-asm
+//@ needs-asm-support
 #![feature(cmse_nonsecure_entry, no_core, lang_items)]
 #![no_core]
+#![crate_type = "lib"]
 #[lang = "sized"]
 trait Sized {}
 #[lang = "copy"]
 trait Copy {}
 impl Copy for u32 {}
 
+//@ build-pass
+// @ compile-flags: -C no-prepopulate-passes -Zbranch-protection=bti
+
+// CHECK-LABEL: @entry_function
 #[no_mangle]
 pub extern "C-cmse-nonsecure-entry" fn entry_function(_: u32, _: u32, _: u32, d: u32) -> u32 {
+    // CHECK: florpsz
     d
 }