[RISCV] Remove -riscv-v-vector-bits-min from LoopVectorize tests. NFC (#148565) If I understand correctly there was a point where we used to need this before it was implied by Zvl*b. Now that it is though and we use -mattr=+v in pretty much every test we can remove it. In unroll-in-loop-vectorizer.ll we can force a VF of 1 instead by using -force-vector-width=1, and in scalable-basics.ll the two RUN lines were the same so I merged them.
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