[AIX] Lint on structs that have a different alignment in AIX's C ABI

compiler/rustc_lint/src/lints.rs

@@ -1692,6 +1692,10 @@ pub(crate) struct OverflowingLiteral<'a> {
     pub lit: String,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(lint_uses_power_alignment)]
+pub(crate) struct UsesPowerAlignment;
+
 #[derive(LintDiagnostic)]
 #[diag(lint_unused_comparisons)]
 pub(crate) struct UnusedComparisons;