print_target_features: Sort output

I didn't find `crt-static` at first, because it was put at the bottom of
a large and otherwise sorted list.

Sort the lists before we print them.

Author: Enselic

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -398,7 +398,10 @@ fn print_target_features(out: &mut dyn PrintBackendInfo, sess: &Session, tm: &ll
         "crt-static",
         "Enables C Run-time Libraries to be statically linked",
     )]);
+    rustc_target_features.sort();
+
     llvm_target_features.retain(|(f, _d)| !known_llvm_target_features.contains(f));
+    llvm_target_features.sort();
 
     let max_feature_len = llvm_target_features
         .iter()