Check that #[cmse_nonsecure_entry] is applied to a function definition
#86622
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This PR fixes #83475. The compiler currently neglects to check whether
#[cmse_nonsecure_entry]is applied to a function (and not, say, a struct) definition, leading to an ICE later on when the type checker attempts to retrieve the function signature. I have fixed this problem by adding an appropriate check to thecheck_attrpass, so that an error is reported instead of an ICE.