[PATCH][arm] build fix for gcc-6 -Werror=shift-negative-value

[Szabolcs Nagy]

binutils does not compile here when building it for aarch64 or arm
targets with gcc trunk native compiler:

opcodes/arm-dis.c: In function 'print_insn_coprocessor':
opcodes/arm-dis.c:3331:20: error: left shift of negative value [-Werror=shift-negative-value]
         imm |= (-1 << 7);
                    ^

The fix assumes 2's complement signed int representation on the host.

Is this OK?

2015-06-15  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* opcodes/arm-dis.c (print_insn_coprocessor): Avoid negative shift.
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