Improve performance for rename-file etc.
Although this does not fix Bug#27986, it is a step forward. I plan to propose a more-significant patch later. * lisp/files.el (directory-name-p): Move from here ... * src/fileio.c (Fdirectory_name_p): ... to here. (directory_like, cp_like_target): New static functions. (Fcopy_file, Frename_file, Fadd_name_to_file) (Fmake_symbolic_link): Use them, to avoid directory-testing syscalls on file names that must be directories if they exist. Omit unnecessary initializations and CHECK_STRING calls. (Frename_file): Don't call file_name_case_insensitive_p twice on the same file. Compare both file names expanded, instead of the old name expanded and the new one unexpanded.
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