Add codegen check tests

Author: Kobzol

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

@@ -323,6 +323,10 @@ impl Step for CodegenBackend {
 
         run_cargo(builder, cargo, builder.config.free_args.clone(), &stamp, vec![], true, false);
     }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::check(self.backend, self.target))
+    }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]

src/bootstrap/src/core/builder/tests.rs

@@ -1243,6 +1243,8 @@ mod snapshot {
         [check] std <host>
         [build] llvm <host>
         [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
         ");
 
         insta::assert_snapshot!(
@@ -1273,6 +1275,8 @@ mod snapshot {
         [build] rustc 0 <host> -> rustc 1 <host>
         [build] rustc 1 <host> -> std 1 <host>
         [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
         ");
     }
 
@@ -1290,6 +1294,8 @@ mod snapshot {
         [build] rustc 1 <host> -> rustc 2 <host>
         [build] rustc 2 <host> -> std 2 <host>
         [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
         ");
     }
 
@@ -1420,6 +1426,21 @@ mod snapshot {
         ");
     }
 
+    #[test]
+    fn check_codegen() {
+        let ctx = TestCtx::new();
+        insta::assert_snapshot!(
+            ctx.config("check")
+                .path("rustc_codegen_cranelift")
+                .render_steps(), @r"
+        [check] std <host>
+        [build] llvm <host>
+        [check] rustc <host>
+        [check] cranelift <host>
+        [check] gcc <host>
+        ");
+    }
+
     #[test]
     fn test_exclude() {
         let ctx = TestCtx::new();