refactor(fe): delete unused functions

Author: strager

src/quick-lint-js/fe/linter.cpp

@@ -14,15 +14,6 @@
 #include <quick-lint-js/port/unreachable.h>
 
 namespace quick_lint_js {
-bool operator==(Linter_Options lhs, Linter_Options rhs) {
-  return lhs.language == rhs.language &&
-         lhs.print_parser_visits == rhs.print_parser_visits;
-}
-
-bool operator!=(Linter_Options lhs, Linter_Options rhs) {
-  return !(lhs == rhs);
-}
-
 void parse_and_lint(Padded_String_View code, Diag_Reporter& reporter,
                     const Global_Declared_Variable_Set& globals,
                     Linter_Options options) {

src/quick-lint-js/fe/linter.h

@@ -16,9 +16,6 @@ struct Linter_Options {
 
   // If true, print a human-readable representation of parser visits to stderr.
   bool print_parser_visits = false;
-
-  friend bool operator==(Linter_Options, Linter_Options);
-  friend bool operator!=(Linter_Options, Linter_Options);
 };
 
 void parse_and_lint(Padded_String_View code, Diag_Reporter&,