[RISCV] Use getNamedOperandIdx in the RVVConstraint checks. (#181936) Instead of using heuristics to find the vd, vs1, vs2, and vm operands, look them up by name. In the course of doing this, I found a few issues that have been fixed in separate PRs, #181887 and #181895 The constraint on SF_VQMACC_2x8x2 had to be updated from Vs2 to Vs1 because the heuristics were finding the wrong operand name before so the constraint had been adjusted to compensate. We still need a bit of a hack to find the destination operand SMLoc for some XSfvcp instructions.
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