[clangd] Add ObjC method support to prepareCallHierarchy
This fixes "textDocument/prepareCallHierarchy" in clangd for ObjC methods. Details at https://github.com/clangd/vscode-clangd/issues/247.
clangd uses Decl::isFunctionOrFunctionTemplate to check if the decl given in a prepareCallHierarchy request is eligible for prepareCallHierarchy. We change to use isFunctionOrMethod which includes functions and ObjC methods.
Reviewed By: kadircet
Differential Revision: https://reviews.llvm.org/D114058