[lld-macho][nfc] Remove HelpHidden from aliases to implemented flags

[int3]

Summary

This is a no-op. Just cleaning up Options.td...

[oontvoo]

LGTM

lld/MachO/Options.td

 def sectcreate : MultiArg<["-"], "sectcreate", 3>,
     MetaVarName<"<segment> <section> <file>">,
     HelpText<"Create <section> in <segment> from the contents of <file>">,
     Group<grp_content>;
 def segcreate : MultiArg<["-"], "segcreate", 3>,
     MetaVarName<"<segment> <section> <file>">,
     Alias<sectcreate>,
     HelpText<"Alias for -sectcreate">,
-    Flags<[HelpHidden]>,
     Group<grp_content>;
 def filelist : Separate<["-"], "filelist">,
     MetaVarName<"<file>">,
     HelpText<"Read names of files to link from <file>">,
     Group<grp_content>;
 def dtrace : Separate<["-"], "dtrace">,
     MetaVarName<"<script>">,
     HelpText<"Enable DTrace static probes according to declarations in <script>">,

 def install_name : Separate<["-"], "install_name">,
     MetaVarName<"<name>">,
     HelpText<"Set an internal install path in a dylib">,
     Group<grp_dylib>;
 def dylib_install_name : Separate<["-"], "dylib_install_name">,
     MetaVarName<"<name>">,
     Alias<install_name>,
     HelpText<"Alias for -install_name">,
-    Flags<[HelpHidden]>,
     Group<grp_dylib>;
 def dylinker_install_name : Separate<["-"], "dylinker_install_name">,
     MetaVarName<"<name>">,
     Alias<install_name>,
     HelpText<"Alias for -install_name">,
-    Flags<[HelpHidden]>,
     Group<grp_dylib>;
 def mark_dead_strippable_dylib : Flag<["-"], "mark_dead_strippable_dylib">,
     HelpText<"Mark output dylib as dead-strippable: When a client links against it but does not use any of its symbols, the dylib will not be added to the client's list of needed dylibs">,
     Group<grp_dylib>;
 def compatibility_version : Separate<["-"], "compatibility_version">,
     MetaVarName<"<version>">,
     HelpText<"Compatibility <version> of this library">,
     Group<grp_dylib>;

 def grp_introspect : OptionGroup<"introspect">, HelpText<"INTROSPECTING THE LINKER">;
 
 def why_load : Flag<["-"], "why_load">,
     HelpText<"Log why each object file is loaded from a static library">,
     Group<grp_introspect>;
 def whyload : Flag<["-"], "whyload">,
     Alias<why_load>,
     HelpText<"Alias for -why_load">,
-    Flags<[HelpHidden]>,
     Group<grp_introspect>;
 def why_live : Separate<["-"], "why_live">,
     MetaVarName<"<symbol>">,
     HelpText<"Log a chain of references to <symbol>, for use with -dead_strip">,
     Flags<[HelpHidden]>,
     Group<grp_introspect>;
 def print_statistics : Flag<["-"], "print_statistics">,
     HelpText<"Log the linker's memory and CPU usage">,

lld/test/MachO/sectcreate.s

 # REQUIRES: x86
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.o
 # RUN: echo "-sectcreate 1.1" >%t1
 # RUN: echo "-sectcreate 1.2" >%t2
 # RUN: echo "-sectcreate 2" >%t3
 # RUN: %lld \
 # RUN:     -sectcreate SEG SEC1 %t1 \
-# RUN:     -sectcreate SEG SEC2 %t3 \
+# RUN:     -segcreate SEG SEC2 %t3 \
 # RUN:     -sectcreate SEG SEC1 %t2 \
 # RUN:     -o %t %t.o
 # RUN: llvm-objdump -s %t | FileCheck %s
 
 # CHECK: Contents of section __TEXT,__text:
 # CHECK: Contents of section __DATA,__data:
 # CHECK: my string!.
 # CHECK: Contents of section SEG,SEC1:

lld/test/MachO/why-load.s

 # REQUIRES: x86
 # RUN: rm -rf %t
 # RUN: split-file %s %t
 
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos -o %t/objc.o %t/objc.s
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos -o %t/foo.o %t/foo.s
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos -o %t/bar.o %t/bar.s
 # RUN: llvm-ar csr  %t/lib.a %t/objc.o %t/foo.o %t/bar.o
 
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos -o %t/main.o %t/main.s
 
 # The first line checks that we never demangle symbols in -why_load output.
 # RUN: %lld %t/main.o %t/lib.a -o /dev/null -why_load -demangle | \
 # RUN:     FileCheck %s --check-prefix=WHY
-# RUN: %lld %t/main.o -force_load %t/lib.a -o /dev/null -why_load | \
+# RUN: %lld %t/main.o -force_load %t/lib.a -o /dev/null -whyload | \
 # RUN:     FileCheck %s --check-prefix=WHYFORCE
 # RUN: %lld %t/main.o %t/lib.a -o /dev/null -all_load -why_load | \
 # RUN:     FileCheck %s --check-prefix=WHYALL
 # RUN: %lld %t/main.o -force_load %t/lib.a -o /dev/null -all_load -why_load | \
 # RUN:     FileCheck %s --check-prefix=WHYALLFORCE
 
 # RUN: %lld %t/main.o %t/lib.a -o /dev/null -ObjC -why_load | \
 # RUN:     FileCheck %s --check-prefix=WHYOBJC