[llvm] [RISCV] Lower SELECT's with one constant more efficiently using Zicond (PR #143581)

[Ryan Buchner via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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bababuck wrote:

Will update the other MR is merged, but this MR relies on that other file being present in order to show the changes.

https://github.com/llvm/llvm-project/pull/143581