Remove Compiler::with_stage

Author: Kobzol

src/bootstrap/src/core/build_steps/test.rs

@@ -1878,7 +1878,7 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
 
         if mode == "rustdoc-json" {
             // Use the stage0 compiler for jsondocck
-            let json_compiler = compiler.with_stage(0);
+            let json_compiler = builder.compiler(0, builder.host_target);
             cmd.arg("--jsondocck-path")
                 .arg(builder.ensure(tool::JsonDocCk { compiler: json_compiler, target }).tool_path);
             cmd.arg("--jsondoclint-path").arg(

src/bootstrap/src/lib.rs

@@ -2109,11 +2109,6 @@ impl Compiler {
         self.forced_compiler = forced_compiler;
     }
 
-    pub fn with_stage(mut self, stage: u32) -> Compiler {
-        self.stage = stage;
-        self
-    }
-
     /// Returns `true` if this is a snapshot compiler for `build`'s configuration
     pub fn is_snapshot(&self, build: &Build) -> bool {
         self.stage == 0 && self.host == build.host_target