remove redundant FIXMEs

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/build_steps/tool.rs

@@ -1091,18 +1091,13 @@ macro_rules! tool_extended {
     }
 }
 
-// NOTE: tools need to be also added to `Builder::get_step_descriptions` in `builder.rs`
-// to make `./x.py build <tool>` work.
 tool_extended!((self, builder),
     Cargofmt, "src/tools/rustfmt", "cargo-fmt", stable=true;
     CargoClippy, "src/tools/clippy", "cargo-clippy", stable=true;
     Clippy, "src/tools/clippy", "clippy-driver", stable=true, add_bins_to_sysroot = ["clippy-driver", "cargo-clippy"];
     Miri, "src/tools/miri", "miri", stable=false, add_bins_to_sysroot = ["miri"];
     CargoMiri, "src/tools/miri/cargo-miri", "cargo-miri", stable=true, add_bins_to_sysroot = ["cargo-miri"];
-    // FIXME: tool_std is not quite right, we shouldn't allow nightly features.
-    // But `builder.cargo` doesn't know how to handle ToolBootstrap in stages other than 0,
-    // and this is close enough for now.
-    Rls, "src/tools/rls", "rls", stable=true, tool_std=true;
+    Rls, "src/tools/rls", "rls", stable=true;
     Rustfmt, "src/tools/rustfmt", "rustfmt", stable=true, add_bins_to_sysroot = ["rustfmt", "cargo-fmt"];
 );
 

src/bootstrap/src/core/builder.rs

@@ -1449,15 +1449,11 @@ impl<'a> Builder<'a> {
             assert_eq!(target, compiler.host);
         }
 
-        if self.config.rust_optimize.is_release() {
-            // FIXME: cargo bench/install do not accept `--release`
-            // and miri doesn't want it
-            match cmd_kind {
-                Kind::Bench | Kind::Install | Kind::Miri | Kind::MiriSetup | Kind::MiriTest => {}
-                _ => {
-                    cargo.arg("--release");
-                }
-            }
+        if self.config.rust_optimize.is_release() &&
+        // cargo bench/install do not accept `--release` and miri doesn't want it
+        !matches!(cmd_kind, Kind::Bench | Kind::Install | Kind::Miri | Kind::MiriSetup | Kind::MiriTest)
+        {
+            cargo.arg("--release");
         }
 
         // Remove make-related flags to ensure Cargo can correctly set things up

src/bootstrap/src/core/download.rs

@@ -616,8 +616,6 @@ impl Config {
         };
 
         // For the beta compiler, put special effort into ensuring the checksums are valid.
-        // FIXME: maybe we should do this for download-rustc as well? but it would be a pain to update
-        // this on each and every nightly ...
         let checksum = if should_verify {
             let error = format!(
                 "src/stage0 doesn't contain a checksum for {url}. \