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[RISCV] Don't fold vmerge.vvm or vmv.v.v into vredsum.vs if AVL chang…
…ed (llvm#99006) When folding, we currently check if the pseudo's result is not lanewise (e.g. vredsum.vs or viota.m) and bail if we're changing the mask. However we also need to check for the AVL too. This patch bails if the AVL changed for these pseudos, and also renames the pseudo table property to be more explicit.
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