[RISCV] Rewrite spill-fpr-scalar.ll test to not use vsetvli. NFC #91428
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It was relying on the fact that vsetvlis have side effects to prevent reordering, but llvm#91319 proposes to remove the side effects. This reworks to use volatile loads and stores instead.
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It was relying on the fact that vsetvlis have side effects to prevent reordering, but #91319 proposes to remove the side effects. This reworks it to use volatile loads and stores instead.