[llvm] [RISCV] Generate landing pad based on cf-protection-branch flag only (PR #179960)

[Kito Cheng via llvm-commits]

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kito-cheng wrote:

The changes here were originally made because we still needed to consider whether to use the NONX7 version [1], so we pulled it out, but now that it's unified, I think it should be restored

[1] https://github.com/llvm/llvm-project/pull/179960/changes/9d798ae81a47e22d69ff6f0cd87e50d43afbffa8

https://github.com/llvm/llvm-project/pull/179960