Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpz/realloc2.c

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+/* mpz_realloc2 -- change allocated data size.
+
+Copyright 2001, 2002, 2008, 2015, 2021, 2022 Free Software Foundation,
+Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+  * the GNU Lesser General Public License as published by the Free
+    Software Foundation; either version 3 of the License, or (at your
+    option) any later version.
+
+or
+
+  * the GNU General Public License as published by the Free Software
+    Foundation; either version 2 of the License, or (at your option) any
+    later version.
+
+or both in parallel, as here.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library.  If not,
+see https://www.gnu.org/licenses/.  */
+
+#include "gmp-impl.h"
+
+void
+mpz_realloc2 (mpz_ptr m, mp_bitcnt_t bits)
+{
+  mp_size_t new_alloc;
+
+  bits -= (bits != 0);		/* Round down, except if 0 */
+  new_alloc = 1 + bits / GMP_NUMB_BITS;
+
+  if (sizeof (unsigned long) > sizeof (int)) /* param vs _mp_size field */
+    {
+      if (UNLIKELY (new_alloc > INT_MAX))
+	MPZ_OVERFLOW;
+    }
+
+  if (ALLOC (m) == 0)
+    {
+      PTR (m) = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc);
+    }
+  else
+    {
+      PTR (m) = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc);
+
+      /* Don't create an invalid number; if the current value doesn't fit after
+	 reallocation, clear it to 0.  */
+      if (ABSIZ(m) > new_alloc)
+	SIZ(m) = 0;
+    }
+
+  ALLOC(m) = new_alloc;
+}