Rename native-comp-deferred-compilation into native-comp-jit-compilation

Rename native-comp-deferred-compilation into native-comp-jit-compilation

	* src/comp.c (maybe_defer_native_compilation, syms_of_comp):
	Rename native-comp-deferred-compilation into
	native-comp-jit-compilation.

	* lisp/subr.el (native-comp-deferred-compilation): Mark
	native-comp-deferred-compilation as obsolete.

	* lisp/startup.el (native-comp-deferred-compilation)
	(normal-top-level): Rename native-comp-deferred-compilation into
	native-comp-jit-compilation.

	* lisp/progmodes/elisp-mode.el
	(emacs-lisp-native-compile-and-load): Likewise.

	* lisp/emacs-lisp/generate-lisp-file.el
	(generate-lisp-file-trailer): Likewise.