CreatePatchLibrary is broken

It seems the FEditorShaderCodeArchive.LoadExistingShaderCodeLibrary missed some functions, use FEditorShaderCodeArchive.AddShaderCodeLibraryFromDirectory instead could fix the issue.

1. Create a project from ThirdPersonTemplate (Any project is fine).
2. Use the Project Launcher to package window platform.
3. Find and back up the folder "Saved\Cooked[Platform_ShaderFormat][ProjectName]\Metadata" in the project folder.
4. Modify a material used in the scene, package the project again.
5. Run commandlet ./UnrealEditor.exe -run=ShaderCodeLibraryTools "Prev MetaData Path" "New MetaData Path" "OutputPath"

It crashed at the following place.

[Image Removed]