[SystemZ] Fold i16/i32/i64 logical RMW operations into memory operands in TableGen (#192802)
Add support for folding logical operations with 8-bit immediates into
memory operands for i16, i32, and i64 types to target LSB. It handles
both 12-bit (NI, OI, XI) and 20-bit signed (NIY, OIY, XIY) displacements.
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Co-authored-by: anoopkg6 <anoopkg6@github.com>