Remove LLDB's recursive directory deletion function.

LLVM now has such a function, so we use that instead.

llvm-svn: 297360

lldb/source/Target/ModuleCache.cpp

@@ -109,7 +109,7 @@ void DeleteExistingModule(const FileSpec &root_dir_spec,
     return;
 
   const auto module_spec_dir = GetModuleDirectory(root_dir_spec, module_uuid);
-  FileSystem::DeleteDirectory(module_spec_dir, true);
+  llvm::sys::fs::remove_directories(module_spec_dir.GetPath());
   lock.Delete();
 }