Re: [PATCH V2] RISC-V: Switch RVV cost model.

LGTM. Regards Robin

[PATCH V2] RISC-V: Switch RVV cost model.

This patch is preparing patch for the following cost model tweak. Since we don't have vector cost model in default tune info (rocket), we set the cost model default as generic cost model by default. The reason we want to switch to generic vector cost model is the default cost model generates