[lld-macho] Remove no_dtrace_dof from un-implemented group.

One fewer warning.
In practice, lld already "implements" it. (ie., it does not do dtrace-dof processing ever).

Reviewed By: #lld-macho, thakis

Differential Revision: https://reviews.llvm.org/D112934

lld/MachO/Options.td

@@ -946,6 +946,9 @@ def mllvm : Separate<["-"], "mllvm">,
 def mcpu : Separate<["-"], "mcpu">,
     HelpText<"Processor family target for LTO code generation">,
     Group<grp_rare>;
+def no_dtrace_dof : Flag<["-"], "no_dtrace_dof">,
+    HelpText<"Disable dtrace-dof processing (default).">,
+    Group<grp_rare>;
 
 def grp_deprecated : OptionGroup<"deprecated">, HelpText<"DEPRECATED">;
 
@@ -1271,10 +1274,6 @@ def no_compact_unwind : Flag<["-"], "no_compact_unwind">,
     HelpText<"This option is undocumented in ld64">,
     Flags<[HelpHidden]>,
     Group<grp_undocumented>;
-def no_dtrace_dof : Flag<["-"], "no_dtrace_dof">,
-    HelpText<"This option is undocumented in ld64">,
-    Flags<[HelpHidden]>,
-    Group<grp_undocumented>;
 def no_new_main : Flag<["-"], "no_new_main">,
     HelpText<"This option is undocumented in ld64">,
     Flags<[HelpHidden]>,

lld/test/MachO/silent-ignore.test

@@ -3,6 +3,7 @@ RUN:   -dynamic \
 RUN:   -no_deduplicate \
 RUN:   -lto_library /lib/foo \
 RUN:   -macosx_version_min 0 \
+RUN:   -no_dtrace_dof \
 RUN:   -dependency_info /path/to/dependency_info.dat \
 RUN:   -lto_library ../lib/libLTO.dylib \
 RUN:   -mllvm -time-passes \