[AArch64] Add -verify-machineinstrs to a test

This would have helped identify problems with #83905 which only showed
up in an LLVM_ENABLE_EXPENSIVE_CHECKS build.

Author: jayfoad

llvm/test/CodeGen/AArch64/stack-probing-no-scratch-reg.mir

@@ -1,5 +1,5 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
-# RUN: llc %s --start-before=shrink-wrap -stop-after=prologepilog -o - | FileCheck %s
+# RUN: llc %s --start-before=shrink-wrap -stop-after=prologepilog -verify-machineinstrs -o - | FileCheck %s
 --- |
   target triple = "aarch64-linux"