[PATCH] [AArch64] Truncate the immediate in logical operation to the register width

[Arnaud Allard de Grandmaison]

Logical 32 bit operations should truncate the immediate to the register
witdth, i.e. 32 bits.

This allows MC assembler to handle instructions like 'and w2, w3, #-3'.

The truncation is not applied blindly : the 32 most significant bits are
checked to be all ones or zeros so that we catch programming errors.

Comments ? OK to apply ?

Cheers,
--
Arnaud de Grandmaison
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