[RFA] Make ARM GAS accept valid strexd instruction

[Jie Zhang]

we don't need operand[1] != operand[2] constraint for strexd, otherwise 
valid instructions like:

strexd	r1, r3, r3, [r4]

would be rejected. This patch removes this constraint. Tested with 
arm-none-eabi. Is it OK?


Jie
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