Split up the ARM so_reg ComplexPattern into so_reg_reg and so_reg_imm,...
Split up the ARM so_reg ComplexPattern into so_reg_reg and so_reg_imm, allowing us to distinguish the encodings that use shifted registers from those that use shifted immediates. This is necessary to allow the fixed-length decoder to distinguish things like BICS vs LDRH. llvm-svn: 135693
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