[RISCV] Support memcmp expansion for vectors This patch adds the support of generating vector instructions for `memcmp`. This implementation is inspired by X86's. We convert integer comparisons (eq/ne only) into vector comparisons and do a vector reduction and to get the result. The range of supported load sizes is (XLEN, VLEN * LMUL8] and non-power-of-2 types are not supported. Fixes #143294. Reviewers: lukel97, asb, preames, topperc, dtcxzyw Reviewed By: topperc, lukel97 Pull Request: https://github.com/llvm/llvm-project/pull/114517
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