Remove unused structs

compiler/rustc_codegen_gcc/src/errors.rs

@@ -32,18 +32,6 @@ pub(crate) enum PossibleFeature<'a> {
     None,
 }
 
-struct ExitCode(Option<i32>);
-
-impl IntoDiagnosticArg for ExitCode {
-    fn into_diagnostic_arg(self) -> DiagnosticArgValue {
-        let ExitCode(exit_code) = self;
-        match exit_code {
-            Some(t) => t.into_diagnostic_arg(),
-            None => DiagnosticArgValue::Str(Cow::Borrowed("<signal>")),
-        }
-    }
-}
-
 #[derive(Diagnostic)]
 #[diag(codegen_gcc_lto_not_supported)]
 pub(crate) struct LTONotSupported;
@@ -81,12 +69,6 @@ pub(crate) struct CopyBitcode {
 #[note]
 pub(crate) struct DynamicLinkingWithLTO;
 
-#[derive(Diagnostic)]
-#[diag(codegen_gcc_load_bitcode)]
-pub(crate) struct LoadBitcode {
-    name: String,
-}
-
 #[derive(Diagnostic)]
 #[diag(codegen_gcc_lto_disallowed)]
 pub(crate) struct LtoDisallowed;