remove unexpected --rustc-args from ./x miri

Author: lqd

src/bootstrap/src/core/config/flags.rs

@@ -392,9 +392,6 @@ pub enum Subcommand {
         /// extra arguments to be passed for the test tool being used
         /// (e.g. libtest, compiletest or rustdoc)
         test_args: Vec<String>,
-        /// extra options to pass the compiler when running tests
-        #[arg(long, value_name = "ARGS", allow_hyphen_values(true))]
-        rustc_args: Vec<String>,
         #[arg(long)]
         /// do not run doc tests
         no_doc: bool,
@@ -501,7 +498,7 @@ impl Subcommand {
 
     pub fn rustc_args(&self) -> Vec<&str> {
         match *self {
-            Subcommand::Test { ref rustc_args, .. } | Subcommand::Miri { ref rustc_args, .. } => {
+            Subcommand::Test { ref rustc_args, .. } => {
                 rustc_args.iter().flat_map(|s| s.split_whitespace()).collect()
             }
             _ => vec![],