Enable opaque pointers

Author: aschwaighofer

lib/ClangImporter/ClangImporter.cpp

@@ -845,7 +845,7 @@ importer::addCommonInvocationArguments(
   invocationArgStrs.push_back("-fansi-escape-codes");
 
   invocationArgStrs.push_back("-Xclang");
-  invocationArgStrs.push_back("-no-opaque-pointers");
+  invocationArgStrs.push_back("-opaque-pointers");
 
   if (importerOpts.ValidateModulesOnce) {
     invocationArgStrs.push_back("-fmodules-validate-once-per-build-session");

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -138,8 +138,8 @@ function(_add_target_variant_c_compile_link_flags)
   if (_lto_flag_out)
     list(APPEND result "${_lto_flag_out}")
     # Disable opaque pointers in lto mode.
-    list(APPEND result "-Xclang")
-    list(APPEND result "-no-opaque-pointers")
+    #list(APPEND result "-Xclang")
+    #list(APPEND result "-no-opaque-pointers")
   endif()
 
   set("${CFLAGS_RESULT_VAR_NAME}" "${result}" PARENT_SCOPE)