Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpn/arm64/darwin.m4

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+divert(-1)
+
+dnl  m4 macros for ARM64 Darwin assembler.
+
+dnl  Copyright 2020 Free Software Foundation, Inc.
+
+dnl  This file is part of the GNU MP Library.
+dnl
+dnl  The GNU MP Library is free software; you can redistribute it and/or modify
+dnl  it under the terms of either:
+dnl
+dnl    * the GNU Lesser General Public License as published by the Free
+dnl      Software Foundation; either version 3 of the License, or (at your
+dnl      option) any later version.
+dnl
+dnl  or
+dnl
+dnl    * the GNU General Public License as published by the Free Software
+dnl      Foundation; either version 2 of the License, or (at your option) any
+dnl      later version.
+dnl
+dnl  or both in parallel, as here.
+dnl
+dnl  The GNU MP Library is distributed in the hope that it will be useful, but
+dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+dnl  for more details.
+dnl
+dnl  You should have received copies of the GNU General Public License and the
+dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
+dnl  see https://www.gnu.org/licenses/.
+
+
+dnl  Standard commenting is with @, the default m4 # is for constants and we
+dnl  don't want to disable macro expansions in or after them.
+
+changecom
+
+
+dnl  LEA_HI(reg,gmp_symbol), LEA_LO(reg,gmp_symbol)
+dnl
+dnl  Load the address of gmp_symbol into a register. We split this into two
+dnl  parts to allow separation for manual insn scheduling.  TODO: Darwin allows
+dnl  for relaxing these two insns into an adr and a nop, but that requires the
+dnl  .loh pseudo for connecting them.
+
+define(`LEA_HI',`adrp	$1, $2@GOTPAGE')dnl
+define(`LEA_LO',`ldr	$1, [$1, $2@GOTPAGEOFF]')dnl
+
+divert`'dnl