Enable importing ptrauth qualified function pointers from c by default

rdar://109235426

Author: meg-gupta

include/swift/Option/FrontendOptions.td

@@ -1225,9 +1225,6 @@ def enable_move_inout_stack_protector :
   Flag<["-"], "enable-move-inout-stack-protector">,
   HelpText<"Enable the stack protector by moving values to temporaries">;
 
-def enable_import_ptrauth_field_function_pointers :
-  Flag<["-"], "enable-import-ptrauth-field-function-pointers">,
-  HelpText<"Enable import of custom ptrauth qualified field function pointers">;
 def disable_import_ptrauth_field_function_pointers :
   Flag<["-"], "disable-import-ptrauth-field-function-pointers">,
   HelpText<"Disable import of custom ptrauth qualified field function pointers">;

lib/Frontend/CompilerInvocation.cpp

@@ -2416,9 +2416,7 @@ static bool ParseSILArgs(SILOptions &Opts, ArgList &Args,
       OPT_enable_move_inout_stack_protector, OPT_disable_stack_protector,
       Opts.EnableMoveInoutStackProtection);
   Opts.EnableImportPtrauthFieldFunctionPointers =
-      Args.hasArg(OPT_enable_import_ptrauth_field_function_pointers,
-                  OPT_disable_import_ptrauth_field_function_pointers,
-                  Opts.EnableImportPtrauthFieldFunctionPointers);
+      !Args.hasArg(OPT_disable_import_ptrauth_field_function_pointers);
   Opts.EnableLifetimeDependenceDiagnostics =
       Args.hasFlag(OPT_enable_lifetime_dependence_diagnostics,
                    OPT_disable_lifetime_dependence_diagnostics,

test/IRGen/ptrauth_field_fptr_import.swift

@@ -1,4 +1,4 @@
-// RUN: %swift-frontend %s -enable-import-ptrauth-field-function-pointers -emit-ir -target arm64e-apple-ios13.0 -I %S/Inputs/ -validate-tbd-against-ir=none -Xllvm -sil-disable-pass=OnoneSimplification | %FileCheck %s
+// RUN: %swift-frontend %s -emit-ir -target arm64e-apple-ios13.0 -I %S/Inputs/ -validate-tbd-against-ir=none -Xllvm -sil-disable-pass=OnoneSimplification | %FileCheck %s
 // REQUIRES: CPU=arm64e
 // REQUIRES: OS=ios
 

test/SILGen/ptrauth_field_fptr_import.swift

@@ -1,4 +1,4 @@
-// RUN: %swift-frontend %s -enable-import-ptrauth-field-function-pointers -emit-silgen -target arm64e-apple-ios13.0 -I %S/Inputs/ | %FileCheck %s
+// RUN: %swift-frontend %s -emit-silgen -target arm64e-apple-ios13.0 -I %S/Inputs/ | %FileCheck %s
 
 // REQUIRES: CPU=arm64e
 // REQUIRES: OS=ios