Remove unnecessary check for DUMMY_SP

The diagnostic printer already omits dummy spans anyway

Author: bjorn3

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -2016,9 +2016,7 @@ impl SharedEmitterMain {
                 Ok(SharedEmitterMessage::InlineAsmError(inner)) => {
                     assert_matches!(inner.level, Level::Error | Level::Warning | Level::Note);
                     let mut err = Diag::<()>::new(sess.dcx(), inner.level, inner.msg);
-                    if !inner.span.is_dummy() {
-                        err.span(inner.span.span());
-                    }
+                    err.span(inner.span.span());
 
                     // Point to the generated assembly if it is available.
                     if let Some((buffer, spans)) = inner.source {