arm.risu: Add patterns for Neon "3 regs different lengths" insns
arm.risu: Add patterns for Neon "3 regs different lengths" insns

stsquad/risu,hw-claudio/risu-aarch64,vivier/risu,stsquad/risu,hw-claudio/risu-aarch64,vivier/risu,stsquad/risu