Add Chromium-only Blender WebEngine parity work

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

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+/* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated.
+
+Copyright 1991, 1993-1995, 2000, 2001, 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_realloc (mpz_ptr m, mp_size_t new_alloc)
+{
+  mp_ptr mp;
+
+  /* Never allocate zero space. */
+  new_alloc = MAX (new_alloc, 1);
+
+  if (sizeof (mp_size_t) == sizeof (int))
+    {
+      if (UNLIKELY (new_alloc > ULONG_MAX / GMP_NUMB_BITS))
+	MPZ_OVERFLOW;
+    }
+  else
+    {
+      if (UNLIKELY (new_alloc > INT_MAX))
+	MPZ_OVERFLOW;
+    }
+
+  if (ALLOC (m) == 0)
+    {
+      mp = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc);
+    }
+  else
+    {
+      mp = __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 (UNLIKELY (ABSIZ (m) > new_alloc))
+	SIZ (m) = 0;
+    }
+
+  PTR (m) = mp;
+  ALLOC(m) = new_alloc;
+  return (void *) mp;
+}