use better default stage for check::Std when stage isn't explicit

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/build_steps/check.rs

@@ -66,10 +66,16 @@ impl Step for Std {
     fn run(self, builder: &Builder<'_>) {
         builder.require_submodule("library/stdarch", None);
 
+        let stage = if builder.config.is_explicit_stage() || builder.top_stage >= 1 {
+            builder.top_stage
+        } else {
+            1
+        };
+
         let target = self.target;
-        let compiler = builder.compiler(builder.top_stage, builder.config.build);
+        let compiler = builder.compiler(stage, builder.config.build);
 
-        if builder.top_stage == 0 {
+        if stage == 0 {
             let mut is_explicitly_called =
                 builder.paths.iter().any(|p| p.starts_with("library") || p.starts_with("std"));