Revert "Auto merge of #117328 - lqd:cranelift-rocket, r=Mark-Simulacrum"

This reverts commit 1dfb6b162b, reversing
changes made to bcb5798dd8.

That commit broke generating nightly rustc docs. Revert it until we can figure out how to have both, cranelift and docs.

src/bootstrap/src/core/build_steps/dist.rs

@@ -1298,10 +1298,6 @@ impl Step for CodegenBackend {
     }
 
     fn run(self, builder: &Builder<'_>) -> Option<GeneratedTarball> {
-        if builder.config.dry_run() {
-            return None;
-        }
-
         // This prevents rustc_codegen_cranelift from being built for "dist"
         // or "install" on the stable/beta channels. It is not yet stable and
         // should not be included.
@@ -1309,10 +1305,6 @@ impl Step for CodegenBackend {
             return None;
         }
 
-        if !builder.config.rust_codegen_backends.contains(&self.backend) {
-            return None;
-        }
-
         if self.backend == "cranelift" {
             if !target_supports_cranelift_backend(self.compiler.host) {
                 builder.info("target not supported by rustc_codegen_cranelift. skipping");
@@ -1351,15 +1343,12 @@ impl Step for CodegenBackend {
         let backends_dst = PathBuf::from("lib").join(&backends_rel);
 
         let backend_name = format!("rustc_codegen_{}", backend);
-        let mut found_backend = false;
         for backend in fs::read_dir(&backends_src).unwrap() {
             let file_name = backend.unwrap().file_name();
             if file_name.to_str().unwrap().contains(&backend_name) {
                 tarball.add_file(backends_src.join(file_name), &backends_dst, 0o644);
-                found_backend = true;
             }
         }
-        assert!(found_backend);
 
         Some(tarball.generate())
     }

src/ci/docker/run.sh

@@ -302,7 +302,6 @@ docker \
   --env DIST_TRY_BUILD \
   --env PR_CI_JOB \
   --env OBJDIR_ON_HOST="$objdir" \
-  --env CODEGEN_BACKENDS \
   --init \
   --rm \
   rust-ci \