Frontend: Remove no-op -stress-astscope-lookup flag

Author: slavapestov

include/swift/Basic/LangOptions.h

@@ -251,9 +251,6 @@ namespace swift {
     /// Someday, ASTScopeLookup will supplant lookup in the parser
     bool DisableParserLookup = false;
 
-    /// Should  we stress ASTScope-based resolution for debugging?
-    bool StressASTScopeLookup = false;
-
     /// Whether to enable the new operator decl and precedencegroup lookup
     /// behavior. This is a staging flag, and will be removed in the future.
     bool EnableNewOperatorLookup = false;

include/swift/Option/FrontendOptions.td

@@ -157,9 +157,6 @@ def disable_target_os_checking :
 def crosscheck_unqualified_lookup : Flag<["-"], "crosscheck-unqualified-lookup">,
   HelpText<"Compare legacy DeclContext- to ASTScope-based unqualified name lookup (for debugging)">;
 
-def stress_astscope_lookup : Flag<["-"], "stress-astscope-lookup">,
-  HelpText<"Stress ASTScope-based unqualified name lookup (for testing)">;
-  
 def use_clang_function_types : Flag<["-"], "use-clang-function-types">,
   HelpText<"Use stored Clang function types for computing canonical types.">;
 

lib/Frontend/CompilerInvocation.cpp

@@ -426,7 +426,6 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
   }
 
   Opts.DisableParserLookup |= Args.hasArg(OPT_disable_parser_lookup);
-  Opts.StressASTScopeLookup |= Args.hasArg(OPT_stress_astscope_lookup);
   Opts.EnableNewOperatorLookup = Args.hasFlag(OPT_enable_new_operator_lookup,
                                               OPT_disable_new_operator_lookup,
                                               /*default*/ false);