Make symbols with positions work with native compilation

This version of the software should bootstrap Emacs successfully with native
compilation enabled.

* lisp/emacs-lisp/bytecomp.el (byte-compile-strip-s-p-1)
(byte-compile-strip-symbol-positions): Rename and move to macroexp.el.  Rename
calls to these functions throughout the file.
(byte-compile-initial-macro-environment): In the code sections for
eval-when-compile and eval-and-compile, call macroexp-strip-symbol-positions
before evaluating code.
(byte-compile-file, byte-compile-output-file-form)
(byte-compile-file-form-defmumble, byte-compile, batch-byte-compile): Call
macroexp-strip-symbol-positions from code being passed to the native compiler.

* lisp/emacs-lisp/cl-macs.el (cl-macs--strip-s-p-1)
(cl-macs--strip-symbol-positions): Remove, replacing them with the renamed
functions in macroexp.el.
(cl-define-compiler-macro): Apply macroexp-strip-symbol-positions to ARGS and
BODY.

* lisp/emacs-lisp/comp.el (comp-limplify-lap-inst): Use `null' to compile
byte-not rather than a compilation of `eq'.
(comp--native-compile): bind symbols-with-pos-enabled to t.

* lisp/emacs-lisp/macroexp.el (byte-compile--ssp-conses-seen)
(byte-compile--ssp-vectors-seen, byte-compile--ssp-records-seen): Provisional
auxiliary variables to support the following functions.
(macroexp--strip-s-p-2, byte-compile-strip-s-p-1)
(macroexp-strip-symbol-positions): Functions moved from bytecomp.el, renamed,
and further developed.
(macroexp--compiler-macro): Bind symbol-with-pos-enabled to t around the call
to `handler'.
(internal-macroexpand-for-load): Strip symbol positions from the form being
eagerly expanded for macros.

* src/comp.c (F_SYMBOLS_WITH_POS_ENABLED_RELOC_SYM): New macro for a
relocation symbol.
(comp_t): New elements bool_ptr_type, f_symbols_with_pos_enabled_ref,
lisp_symbol_with_position, lisp_symbol_with_position_header,
lisp_symbol_with_position_sym, lisp_symbol_with_position_pos,
lisp_symbol_with_position_type, lisp_symbol_with_position_ptr_type,
get_symbol_with_position.
(helper_GET_SYMBOL_WITH_POSITION): New function.
(emit_BASE_EQ): Function rename from emit_EQ.
(emit_AND, emit_OR, emit_BARE_SYMBOL_P, emit_SYMBOL_WITH_POS_P)
(emit_SYMBOL_WITH_POS_SYM): New functions.
(emit_EQ): New function which handles symbols with position correctly.
(emit_NILP): Use emit_BASE_EQ rather than emit_EQ.
(emit_limple_insn): When emitting a conditional branch, check each operand for
being a literal Qnil, and if one of them is, use emit_BASE_EQ rather than
emit_EQ.
(declare_runtime_imported_funcs): Declare helper_GET_SYMBOL_WITH_POSITION.
(emit_ctxt_code): Export the global F_SYMBOLS_WITH_POS_ENABLED_RELOC_SYM.
(define_lisp_symbol_with_position, define_GET_SYMBOL_WITH_POSITION): New
functions.
(Fcomp__init_ctxt): Initialise comp.bool_ptr_type, call the two new
define_.... functions.
(load_comp_unit): Initialise **f_symbols_with_pos_enabled_reloc.

* src/fns.c (Fput): Strip positions from symbols in PROPNAME and VALUE.

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