[RISCV] Re-work how VWADD_W_VL and similar _W_VL nodes are handled in combineOp_VLToVWOp_VL. (#159205) These instructions have one already narrow operand. Previously, we pretended like this operand was a supported extension. This could cause problems when we called getOrCreateExtendedOp on this narrow operand when creating the the VWADD_VL. If the narrow operand happened to be an extend of the opposite type, we would peek through it and then rebuild it with the wrong extension type. So (vwadd_w_vl (i32 (sext X)), (i16 (zext Y))) would become (vwadd_vl (i16 (sext X)), (i16 (sext Y))). To prevent this, we ignore the operand instead and pass std::nullopt for SupportsExt to getOrCreateExtendedOp so it won't peek through any extends on the narrow source. Fixes #159152.
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