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These aren't really needed; if it's for a 32-bit architecture that can't
handle 64-bit shifts, then the instruction won't be decoded in the first
place. Because the registerSize is derived from the address size, it may
interfere with 64-bit architectures that are using signed 32-bit
addresses.
There are a few other places that check registerSize (for example, the
32->64 bit sign extension idiom and MADD, MADDU) that are suspect, but
not included in this commit. The difference is that for 64-bit shifts,
checking at all for the register size is the problem; for those, the
check is still needed to figure out whether to sign extend or not, but
the value of registerSize is suspect.
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