[llvm] [RISCV][VLOPT] Skip EMUL if it is unknown before entering EMULAndEEWAreEqual (PR #139670)

[Luke Lau via llvm-commits]

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lukel97 wrote:

Nit, can you move this into vl-opt.ll and replace the VP intrinsics with RISC-V intrinsics? Just in case the VP intrinsics lowering ever changes

https://github.com/llvm/llvm-project/pull/139670