Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/tune/x86_64.asm

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+dnl  x86 pentium time stamp counter access routine.
+
+dnl  Copyright 1999, 2000, 2003-2005 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/.
+
+
+include(`../config.m4')
+
+
+C void speed_cyclecounter (unsigned p[2]);
+C
+C Get the pentium rdtsc cycle counter, storing the least significant word in
+C p[0] and the most significant in p[1].
+C
+C cpuid is used to serialize execution.  On big measurements this won't be
+C significant but it may help make small single measurements more accurate.
+
+PROLOGUE(speed_cyclecounter)
+
+	C rdi	p
+
+	movq	%rbx, %r10
+	xorl	%eax, %eax
+	cpuid
+	rdtsc
+	movl	%eax, (%rdi)
+	movl	%edx, 4(%rdi)
+	movq	%r10, %rbx
+	ret
+EPILOGUE()