lint: port asm labels diagnostics

Signed-off-by: David Wood <[email protected]>

Author: davidtwco

compiler/rustc_error_messages/locales/en-US/lint.ftl

@@ -396,3 +396,5 @@ lint-builtin-clashing-extern-diff-name = `{$this_fi}` redeclares `{$orig}` with
 
 lint-builtin-deref-nullptr = dereferencing a null pointer
     .label = this code causes undefined behavior when executed
+
+lint-builtin-asm-labels = avoid using named labels in inline assembly

compiler/rustc_lint/src/builtin.rs

@@ -3182,9 +3182,7 @@ impl<'tcx> LateLintPass<'tcx> for NamedAsmLabels {
                             NAMED_ASM_LABELS,
                             Some(target_spans),
                             |diag| {
-                                let mut err =
-                                    diag.build("avoid using named labels in inline assembly");
-                                err.emit();
+                                diag.build(fluent::lint::builtin_asm_labels).emit();
                             },
                             BuiltinLintDiagnostics::NamedAsmLabel(
                                 "only local labels of the form `<number>:` should be used in inline asm"