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[RISCV] Use vwadd.vx for splat vector with extension (llvm#87249)
This patch allows `combineBinOp_VLToVWBinOp_VL` to handle patterns like `(splat_vector (sext op))` or `(splat_vector (zext op))`. Then we can use `vwadd.vx` and `vwadd.w` for such a case. ### Source code ``` define <vscale x 8 x i64> @vwadd_vx_splat_sext(<vscale x 8 x i32> %va, i32 %b) { %sb = sext i32 %b to i64 %head = insertelement <vscale x 8 x i64> poison, i64 %sb, i32 0 %splat = shufflevector <vscale x 8 x i64> %head, <vscale x 8 x i64> poison, <vscale x 8 x i32> zeroinitializer %vc = sext <vscale x 8 x i32> %va to <vscale x 8 x i64> %ve = add <vscale x 8 x i64> %vc, %splat ret <vscale x 8 x i64> %ve } ``` ### Before this patch [Compiler Explorer](https://godbolt.org/z/sq191PsT4) ``` vwadd_vx_splat_sext: sext.w a0, a0 vsetvli a1, zero, e64, m8, ta, ma vmv.v.x v16, a0 vsetvli zero, zero, e32, m4, ta, ma vwadd.wv v16, v16, v8 vmv8r.v v8, v16 ret ``` ### After this patch ``` vwadd_vx_splat_sext vsetvli a1, zero, e32, m4, ta, ma vwadd.vx v16, v8, a0 vmv8r.v v8, v16 ret ```
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