[llvm] [SimplifyCFG] Set branch weights when merging conditional store to address (PR #154841)

[Joel E. Denny via llvm-commits]

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@@ -190,5 +191,31 @@ LLVM_ABI bool hasExplicitlyUnknownBranchWeights(const Instruction &I);
 /// Scaling the profile data attached to 'I' using the ratio of S/T.
 LLVM_ABI void scaleProfData(Instruction &I, uint64_t S, uint64_t T);
 
+/// get the branch weights of a branch conditioned on b1 | b2, where b1 and b2
+/// are 2 booleans that are the condition of 2 branches for which we have the
+/// branch weights B1 and B2, respectivelly.
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jdenny-ornl wrote:

```suggestion
/// Get the branch weights of a branch conditioned on b1 || b2, where b1 and b2
/// are 2 booleans that are the conditions of 2 branches for which we have the
/// branch weights B1 and B2, respectively.
```

https://github.com/llvm/llvm-project/pull/154841