Miscellaneous enhancements to scratch/correct-warning-pos.

1. Check the type (symbol with position) of the argument given to the native
compiled version of SYMBOL_WITH_POS_SYM.
2. Handle infinite recursion caused by circular lists, etc., in
macroexp-strip-symbol-positions by using hash tables.
3. Read byte compiled functions without giving symbols positions.

* lisp/emacs-lisp/comp.el (comp-finalize-relocs): Add symbol-with-pos-p into
the list of relocated symbols.

* lisp/emacs-lisp/macroexp.el (macroexp--ssp-conses-seen)
(macroexp--ssp-vectors-seen, macroexp--ssp-records-seen): Renamed, and
animated as hash tables.
(macroexp--strip-s-p-2): Optionally tests for the presence of an argument in
one of the above hash tables, so as to handle otherwise infinite recursion.
(byte-compile-strip-s-p-1): Add a condition-case to handle infinite recursion
caused by circular lists etc., using the above hash tables as required.

* src/comp.c (comp_t): New element symbol_with_pos_sym.
(emit_SYMBOL_WITH_POS_SYM): Amend just to call the new SYMBOL_WITH_POS_SYM.
(emit_CHECK_SYMBOL_WITH_POS, define_SYMBOL_WITH_POS_SYM): New functions.
(Fcomp__init_ctxt): Register an emitter for Qsymbol_with_pos_p.
(Fcomp__compile_ctxt_to_file): Call define_SYMBOL_WITH_POS_SYM.
(syms_of_comp): Define Qsymbol_with_pos_p.

* src/data.c (syms_of_data): Define a new error symbol Qrecursion_error, an
error category for the new error symbols Qexcessive_variable_binding and
Qexcessive_lisp_nesting.

* src/eval.c (grow_specpdl): Change the signal_error call to an xsignal0 call
using the new error symbol Qexcessive_variable_binding.
(eval_sub, Ffuncall): Change the `error' calls to xsignal using the new error
symbol Qexcessive_lisp_nesting.

* src/lread.c (read1): When reading a compiled function, read the components
of the vector without giving its symbols a position.

lisp/emacs-lisp/comp.el

@@ -3576,7 +3576,7 @@ Update all insn accordingly."
   ;; Symbols imported by C inlined functions.  We do this here because
   ;; is better to add all objs to the relocation containers before we
   ;; compacting them.
-  (mapc #'comp-add-const-to-relocs '(nil t consp listp))
+  (mapc #'comp-add-const-to-relocs '(nil t consp listp symbol-with-pos-p))
 
   (let* ((d-default (comp-ctxt-d-default comp-ctxt))
          (d-default-idx (comp-data-container-idx d-default))