Fix compilation error with simultaneous dynamic+lexical scoping.

Add warning when a defvar appears after the first let-binding.
* lisp/emacs-lisp/bytecomp.el (byte-compile-lexical-variables): New var.
(byte-compile-close-variables): Initialize it.
(byte-compile--declare-var): New function.
(byte-compile-file-form-defvar)
(byte-compile-file-form-define-abbrev-table)
(byte-compile-file-form-custom-declare-variable): Use it.
(byte-compile-make-lambda-lexenv): Change the argument.  Simplify.
(byte-compile-lambda): Share call to byte-compile-arglist-vars.
(byte-compile-bind): Handle dynamic bindings that shadow
lexical bindings.
(byte-compile-unbind): Make arg non-optional.
(byte-compile-let): Simplify.
* lisp/emacs-lisp/cconv.el (byte-compile-lexical-variables): Declare var.
(cconv--analyse-function, cconv-analyse-form): Populate it.
Protect byte-compile-bound-variables to limit the scope of defvars.
(cconv-analyse-form): Add missing rule for (defvar <foo>).
Remove unneeded rule for `declare'.

* lisp/emacs-lisp/cl-macs.el (cl--compiler-macro-adjoin): Use macroexp-let2
so as to avoid depending on cl-adjoin at run-time.
* lisp/emacs-lisp/cl-lib.el (cl-pushnew): Use backquotes.

* lisp/emacs-lisp/macroexp.el (macroexp--compiling-p): New function.
(macroexp--warn-and-return): Use it.

lisp/emacs-lisp/cl-lib.el

@@ -156,8 +156,8 @@ an element already on the list.
                  ;; earlier and should have triggered them already.
                  (with-no-warnings ,place)
                (setq ,place (cons ,var ,place))))
-	(list 'setq place (cl-list* 'cl-adjoin x place keys)))
-    (cl-list* 'cl-callf2 'cl-adjoin x place keys)))
+	`(setq ,place (cl-adjoin ,x ,place ,@keys)))
+    `(cl-callf2 cl-adjoin ,x ,place ,@keys)))
 
 (defun cl--set-elt (seq n val)
   (if (listp seq) (setcar (nthcdr n seq) val) (aset seq n val)))