Allow for native compilation qualities to be specified per input file

Allow for native compilation qualities to be specified per input file

	* lisp/emacs-lisp/bytecomp.el (byte-native-qualities): Define
	variable.
	(byte-compile-from-buffer): Spill compilation qualities.
	* lisp/emacs-lisp/comp.el (comp-speed, comp-debug): Make
	them file local variables.
	(comp-ctxt): Add `speed' and `debug' slots.
	(comp-spill-speed, comp-spill-lap-function): Make use of these.
	(comp-spill-lap-function): Spill qualities from
	`byte-native-qualities'.
	(comp-limplify-top-level): Do not use `comp-speed' but ctxt value
	unstead.
	(comp-final): Do not propagate qualities as they are already
	in the `comp-ctxt'.
	(comp--native-compile): Close on `byte-native-qualities'.
	* src/comp.c (comp_t): Add 'speed' and 'debug' fields.
	(emit_comment, emit_mvar_rval, emit_static_object)
	(emit_ctxt_code, Fcomp__init_ctxt): Use these instead of the
	global variables.
	(Fcomp__compile_ctxt_to_file): Set comp.speed and comp.debug and
	use them.