Update the documented default of -Zmutable-noalias

Author: cuviper

compiler/rustc_session/src/options.rs

@@ -1193,7 +1193,7 @@ options! {
     move_size_limit: Option<usize> = (None, parse_opt_number, [TRACKED],
         "the size at which the `large_assignments` lint starts to be emitted"),
     mutable_noalias: Option<bool> = (None, parse_opt_bool, [TRACKED],
-        "emit noalias metadata for mutable references (default: yes for LLVM >= 12, otherwise no)"),
+        "emit noalias metadata for mutable references (default: yes)"),
     new_llvm_pass_manager: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "use new LLVM pass manager (default: no)"),
     nll_facts: bool = (false, parse_bool, [UNTRACKED],