[COMMITTED][AArch64] Fix the bit pattern order in the comments in auto-generated file

[Jiong Wang]

Laurent Desnogues reported a AArch64 GAS assembler issue in the auto-generated
file.
                                                                                                           
The bit pattern comment in "aarch64_opcode_lookup_1" is reversed.
                                                                                                           
This patch fixed this, the change in the comment is something like the
following:

@@ -38,7 +38,7 @@ aarch64_opcode_lookup_1 (uint32_t word)
                      {
                        /* 33222222222211111111110000000000
                           10987654321098765432109876543210
-                         xxxxxxxxxxxxxxxxxxxxxxxx0000xxx0
+                         0xxx0000xxxxxxxxxxxxxxxxxxxxxxxx
                           adr.  */

The generated file is not included in the attached patch as it boost the patch
size.

Build under --enable-maintainer-mode OK. Eyeballed to make sure there is only
comments change in aarch64-dis-2.c, also a quick cross as/ld check OK.
                                                                                                           
opcodes/
2017-07-24  Laurent Desnogues <laurent.desnogues@arm.com>
             Jiong Wang  <jiong.wang@arm.com>
                                                                                                           
         * aarch64-gen.c (print_decision_tree_1): Reverse the index of PATTERN to
         correct the print.
         * aarch64-dis-2.c: Regenerated.

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