[llvm-readelf] Make -W an alias of --wide

Currently -W and --wide are treated as two options as they are only
included for gnu readelf compatibility and ignored. This change makes -W
an alias of --wide to be consistent with other option aliases.

Differential Revision: https://reviews.llvm.org/D111731

llvm/tools/llvm-readobj/Opts.td

@@ -87,8 +87,8 @@ def help : FF<"help", "Display this help">;
 def version : FF<"version", "Display the version">;
 
 // Ignored for GNU readelf compatibility.
-def : F<"W", "Ignored for GNU readelf compatibility">;
-def : FF<"wide", "Ignored for GNU readelf compatibility">;
+def wide : FF<"wide", "Ignored for GNU readelf compatibility">;
+def : F<"W", "Ignored for GNU readelf compatibility">, Alias<wide>;
 
 // Traditional llvm-readobj Aliases.
 def : Flag<["--"], "dt">, Alias<dyn_syms>, HelpText<"Alias for --dyn-syms">;