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

This reverts commit 1dfb6b1, reversing
changes made to bcb5798.

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

Author: RalfJung

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

@@ -1298,21 +1298,13 @@ 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.
         if !builder.build.unstable_features() {
             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 \