[RISCV] Replace VPatBinaryV_VX_VROTATE with VPatBinaryV_VX. NFC (#178254) VPatBinaryV_VX_VROTATE appeared to be almost exact copy and paste of VPatBinaryV_VX except it used 'XLenVT' instead of 'vti.Scalar'. 'vti.Scalar' is 'XLenVT' for integer vectors so this wasn't a real difference. This change allows VV_VX or VV_VX_VI combination classes to be used, further reducing the code. No tablegen outputs change with this patch.
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