Rollup merge of #97752 - klensy:cg-typo, r=bjorn3

typo: `-Zcodegen-backend=llvm -Cpasses=list` should work now

r? ```@bjorn3```

compiler/rustc_driver/src/lib.rs

@@ -1055,13 +1055,7 @@ pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
     }
 
     if cg_flags.iter().any(|x| *x == "passes=list") {
-        let backend_name = debug_flags.iter().find_map(|x| {
-            if x.starts_with("codegen-backend=") {
-                Some(&x["codegen-backends=".len()..])
-            } else {
-                None
-            }
-        });
+        let backend_name = debug_flags.iter().find_map(|x| x.strip_prefix("codegen-backend="));
         get_codegen_backend(&None, backend_name).print_passes();
         return None;
     }