[AArch64] Binutils/gas/ld port for ARM's new 64-bit architecture, AArch64 [2/6] opcodes changes

[nick clifton]

Hi Yufeng Zhang,
I had some problems with the opcodes part of this port.  Specifically:

   * A toolchain configured with --enable-targets=all 
--enable-64-bit-bfd would not build because aarch64-asm-2.c, 
aarch64-dis-2.c and aarch64-opc-2.c are not built.  I would suggest 
adding them to TARGET_LIBOPCODES_CFILES in opcodes/Makefile.am.

   * aarch64-opc.c does not build on a 32-bit host because you have 
mismatching types in a couple of the printf() statements.

Cheers
   Nick