[PATCH] Correct printing of pre-indexed operands

[Mihail Popa]

Hi.

According to the ARM reference manual, constant offsets are mandatory for pre-indexed addressing modes. Currently the MC disassembler
does not obey this when the offset is 0. It produces instructions like: str r0, [r1]!. Correct syntax is: str r0, [r1, #0]!.

This change modifies the dumping of operands so that the offset is always printed, regardless of its value, when pre-indexed addressing mode
is used.

Patch attached for review.

Thanks,
Mihai

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