[ValueTypes][RISCV] Add v1bf16 type (#111112) When trying to add RISC-V fadd reduction cost model tests for bf16, I noticed a crash when the vector was of <1 x bfloat>. It turns out that this was being scalarized because unlike f16/f32/f64, there's no v1bf16 value type, and the existing cost model code assumed that the legalized type would always be a vector. This adds v1bf16 to bring bf16 in line with the other fp types. It also adds some more RISC-V bf16 reduction tests which previously crashed, including tests to ensure that SLP won't emit fadd/fmul reductions for bf16 or f16 w/ zvfhmin after #111000.
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