45 FileSystem &FileSystem::Instance() { return *InstanceImpl(); }  in Instance()
48   lldbassert(!InstanceImpl() && "Already initialized.");  in Initialize()
49   InstanceImpl().emplace();  in Initialize()
53   lldbassert(!InstanceImpl() && "Already initialized.");  in Initialize()
54   InstanceImpl().emplace(collector);  in Initialize()
58   lldbassert(!InstanceImpl() && "Already initialized.");  in Initialize()
66   InstanceImpl().emplace(llvm::vfs::getVFSFromYAML(std::move(buffer.get()),  in Initialize()
74   lldbassert(!InstanceImpl() && "Already initialized.");  in Initialize()
75   InstanceImpl().emplace(fs);  in Initialize()
79   lldbassert(InstanceImpl() && "Already terminated.");  in Terminate()
80   InstanceImpl().reset();  in Terminate()
83 Optional<FileSystem> &FileSystem::InstanceImpl() {  in InstanceImpl()  function in FileSystem