Convert before final function doc hash into a vector.

Convert before final function doc hash into a vector.

	* lisp/emacs-lisp/comp.el (comp-finalize-relocs): Convert doc hash
	table into vector befor final.
	(comp-emit-for-top-level): Rename `comp-ctxt-doc-index-h' ->
	`comp-ctxt-function-docs'.
	(comp-ctxt): Likewise.

	* src/comp.c (native_function_doc): Update logic for documentation
	being a vector.
	(emit_ctxt_code): Update for 'comp-ctxt-doc-index-h' slot rename.

	* src/comp.h (struct Lisp_Native_Comp_Unit): Rename 'data_fdoc_h'
	into data_fdoc_v.

	* src/pdumper.c (dump_native_comp_unit): Likewise.