MC parser and PPC variants on constants

[Joerg Sonnenberger]

Hi all,
PowerPC assembler supports expressions like "1234 at l". This doesn't with
MC right now, because the constant expression never reaches the target
layer. I wonder if it is really that useful to refactor this ATM,
especially since it likely makes sense to share the variant codes at
some point as many RISC platforms have similar needs in this area.

Joerg
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