[RFA] ARM NEON: reject instructions with bad alignment

[Jie Zhang]

Large (128/256-bit) alignment qualifiers are only allowed on NEON 
vldN/vstN instructions when the data being loaded is a multiple of those 
sizes. GAS incorrectly accepts any alignment qualifier. For example the 
following should be rejected:

vld1.8 {d0}, [r0, :128]
vld1.8 {q0}, [r0, :256]

With this patch, GAS will reject these two invalid instructions. Tested 
GAS with arm-none-eabi target. Is it OK?


Jie
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