ELF lld: Ignore -EL and -EB options

[emaste]

Summary

GNU ld supports -EL and -EB options to choose a default output format (big- or little-endian). We choose the appropriate endianness based on the format of the input objects and can ignore these options.

We could produce an error if -EL / -EB did not match the endianness of the input objects, but I don't think it's worthwhile.

[ruiu]

ELF/Options.td

265–267

Please sort.

Instead of Separate, I think you want to do F<"EB"> because -EB doesn't take arguments, and -EB and --EB are both valid.

[emaste]

Sort, use F<> per @ruiu.

[ruiu]

LGTM

ELF/Options.td

 def no_mmap_output_file: F<"no-mmap-output-file">;
 def no_warn_common: F<"no-warn-common">;
 def no_warn_mismatch: F<"no-warn-mismatch">;
 def rpath_link: S<"rpath-link">;
 def rpath_link_eq: J<"rpath-link=">;
 def sort_common: F<"sort-common">;
 def warn_execstack: F<"warn-execstack">;
 def warn_shared_textrel: F<"warn-shared-textrel">;
 def G: Separate<["-"], "G">;
+def EB : Separate<["-"], "EB">;
+def EL : Separate<["-"], "EL">;
 
 // Aliases for ignored options
 def alias_define_common_d: Flag<["-"], "d">, Alias<define_common>;
 def alias_define_common_dc: F<"dc">, Alias<define_common>;
 def alias_define_common_dp: F<"dp">, Alias<define_common>;
 def alias_version_script_version_script: J<"version-script=">,
   Alias<version_script>;