Revert new flag that is no longer nessisary

Author: zoecarver

include/swift/Basic/LangOptions.h

@@ -268,8 +268,6 @@ namespace swift {
     /// Imports getters and setters as computed properties.
     bool CxxInteropGettersSettersAsProperties = false;
 
-    bool EnableUnsafeEagerCxxImporting = false;
-
     /// On Darwin platforms, use the pre-stable ABI's mark bit for Swift
     /// classes instead of the stable ABI's bit. This is needed when
     /// targeting OSes prior to macOS 10.14.4 and iOS 12.2, where

include/swift/Option/FrontendOptions.td

@@ -282,12 +282,6 @@ def enable_experimental_cxx_interop :
   Flag<["-"], "enable-experimental-cxx-interop">,
   HelpText<"Enable C++ interop code generation and config directives">;
 
-def enable_unsafe_eager_importing :
-  Flag<["-"], "enable-unsafe-eager-importing">,
-  HelpText<"Enable unsafe eager importing of C++ APIs. This is the legacy mode "
-            "of importing. The clang importer will try to import every API in a "
-            "module/header.">;
-
 def enable_lexical_borrow_scopes :
   Joined<["-"], "enable-lexical-borrow-scopes=">,
   HelpText<"Whether to emit lexical borrow scopes (default: true)">,

lib/Frontend/CompilerInvocation.cpp

@@ -807,7 +807,6 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
                    Target.isOSDarwin());
 
   Opts.CxxInteropGettersSettersAsProperties = Args.hasArg(OPT_cxx_interop_getters_setters_as_properties);
-  Opts.EnableUnsafeEagerCxxImporting = Args.hasArg(OPT_enable_unsafe_eager_importing);
 
   Opts.VerifyAllSubstitutionMaps |= Args.hasArg(OPT_verify_all_substitution_maps);