[RISCV] Add tests for rv32 gather/scatter costs. NFC There's a divergence with the rv32 costs that I plan on fixing in another patch, so this precommits the tests for them. The zve32f RUN lines were split off into another file so the check prefixes are easier to reason about. The -riscv-v-vector-bits-max RUN lines were also removed to simplify the check prefixes since I'm not sure if they were intentionally testing any specific logic. (cherry picked from commit 3ad6d350c44f54482a86a7eb488732093eaed372)
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