Rollup merge of #110515 - jyn514:download-rustc-llvm, r=albertlarsan68

Don't special-case download-rustc in `maybe_install_llvm`

This is no longer necessary now that the llvm in `rust-dev` matches the one in `rustc`.

cc #110490 (comment), #110263

Author: matthiaskrgr

src/bootstrap/dist.rs

@@ -1965,20 +1965,6 @@ fn maybe_install_llvm(builder: &Builder<'_>, target: TargetSelection, dst_libdir
         }
     }
 
-    // FIXME: for reasons I don't understand, the LLVM so in the `rustc` component is different than the one in `rust-dev`.
-    // Only the one in `rustc` works with the downloaded compiler.
-    if builder.download_rustc() && target == builder.build.build {
-        let src_libdir = builder.ci_rustc_dir(target).join("lib");
-        for entry in t!(std::fs::read_dir(&src_libdir)) {
-            let entry = t!(entry);
-            if entry.file_name().to_str().unwrap().starts_with("libLLVM-") {
-                install_llvm_file(builder, &entry.path(), dst_libdir);
-                return !builder.config.dry_run();
-            }
-        }
-        panic!("libLLVM.so not found in src_libdir {}!", src_libdir.display());
-    }
-
     // On macOS, rustc (and LLVM tools) link to an unversioned libLLVM.dylib
     // instead of libLLVM-11-rust-....dylib, as on linux. It's not entirely
     // clear why this is the case, though. llvm-config will emit the versioned