add: lints.rs

add: `lints.rs`
refactor: move `InvalidAtomicOrderingDiag` to `lints.rs`

compiler/rustc_lint/src/lints.rs

@@ -0,0 +1,11 @@
+use rustc_macros::LintDiagnostic;
+use rustc_span::{Symbol, Span};
+
+#[derive(LintDiagnostic)]
+#[diag(lint_atomic_ordering_invalid)]
+#[help]
+pub struct InvalidAtomicOrderingDiag {
+    pub method: Symbol,
+    #[label]
+    pub fail_order_arg_span: Span,
+}