[llvm] [RISCV] Optimize conditional branches that can be statically evaluated (PR #131684)

[Philip Reames via llvm-commits]

preames wrote:

Another possibility on factoring.  Have you explored what happens if rather than actually performing the branch rewrite, you just adjust the result from analyzeBranch to reflect the fact this branch is unconditional?  (That is, after parseCondBranch, check if the condition is constant, and setup out-params as-if it were?)  

https://github.com/llvm/llvm-project/pull/131684