[RISCV] Separate addend from FMA operands to support cascade FMA. NFC. (#70241)
This PR separate addend from FMA operands to support cascade FMA. In some microarchitectures (e.g., ARM cortex-a72 and XiangShan-NanHu), FP multiply-accumulate pipelines support late-forwarding of accumulate operands, which reduces the latency of a sequence of multiply-accumulate instructions. See also #70232.
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