[PATCH] ARM: fix CPS decoding

[Amaury de la Vieuville]

Hi,

This patch fixes the decoding of CPS in some cases where it is ambiguous
with QADD.
CPS is ambiguous with several other instructions, their decoders check
for pred==0xf but do not check the rest of the encoding, we have to
check for this in decodeCPSInstruction().
This is usually done at the call site but I think in this case - as
there are many of them - it is better to do that directly in the decode
method of the instruction. 

Thanks,
Amaury 
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