Clean up left over Emacs-18/19 code, inline byte-code-functions.

Clean up left over Emacs-18/19 code, inline byte-code-functions.
* lisp/emacs-lisp/byte-opt.el (byte-inline-lapcode): Move to bytecomp.el.
(byte-compile-inline-expand): Inline all bytecompiled functions.
Unify the inlining code of the lexbind and dynbind interpreted functions.
(byte-compile-unfold-lambda): Don't handle byte-compiled functions at all.
(byte-optimize-form-code-walker): Don't optimize byte-compiled inlined
functions here.
(byte-compile-splice-in-already-compiled-code): Remove.
(byte-code): Don't optimize it any more.
(byte-decompile-bytecode-1): Remove unused bytedecomp-bytes.
Leave `byte-return's even for `make-spliceable'.
* lisp/emacs-lisp/bytecomp.el (byte-compile-file-form-defmumble):
byte-compile-lambda now always returns a byte-code-function.
(byte-compile-byte-code-maker, byte-compile-byte-code-unmake)
(byte-compile-closure): Remove.
(byte-compile-lambda): Always return a byte-code-function.
(byte-compile-top-level): Don't handle `byte-code' forms specially.
(byte-compile-inline-lapcode): New function, taken from byte-opt.el.
(byte-compile-unfold-bcf): New function.
(byte-compile-form): Use it to optimize inline byte-code-functions.
(byte-compile-function-form, byte-compile-defun): Simplify.
(byte-compile-defmacro): Don't bother calling
byte-compile-byte-code-maker.