x86: avoid string copy when swapping Vex.W controlled operands

Now that op_out[] is an array of pointers, there's no need anymore to
copy strings. Simply swap the pointers.

opcodes/i386-dis.c

diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c
index 602535d..d087b35 100644
--- a/opcodes/i386-dis.c
+++ b/opcodes/i386-dis.c
@@ -13473,9 +13473,10 @@
   if (ins->vex.w)
     {
       /* Swap 2nd and 3rd operands.  */
-      strcpy (ins->scratchbuf, ins->op_out[2]);
-      strcpy (ins->op_out[2], ins->op_out[1]);
-      strcpy (ins->op_out[1], ins->scratchbuf);
+      char *tmp = ins->op_out[2];
+
+      ins->op_out[2] = ins->op_out[1];
+      ins->op_out[1] = tmp;
     }
 }
 
@@ -13503,9 +13504,10 @@
   if (ins->vex.w)
     {
       /* Swap 3rd and 4th operands.  */
-      strcpy (ins->scratchbuf, ins->op_out[3]);
-      strcpy (ins->op_out[3], ins->op_out[2]);
-      strcpy (ins->op_out[2], ins->scratchbuf);
+      char *tmp = ins->op_out[3];
+
+      ins->op_out[3] = ins->op_out[2];
+      ins->op_out[2] = tmp;
     }
 }