[llvm] [RISCV] Macro-fusion support for veyron-v1 CPU. (PR #70012)

[Wang Pengcheng via llvm-commits]

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+# REQUIRES: asserts
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wangpc-pp wrote:

Do we need end-to-end llc tests like `llvm/test/CodeGen/RISCV/macro-fusion-lui-addi.ll`?

https://github.com/llvm/llvm-project/pull/70012