[llvm] [StructurizeCFG] Hoist and simplify zero-cost incoming else phi values (PR #139605)

[Matt Arsenault via llvm-commits]

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@@ -385,16 +393,21 @@ class StructurizeCFGLegacyPass : public RegionPass {
       if (SCFG.makeUniformRegion(R, UA))
         return false;
     }
+    Function *F = R->getEntry()->getParent();
+    TargetTransformInfo *TTI =
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arsenm wrote:

```suggestion
    const TargetTransformInfo *TTI =
```

https://github.com/llvm/llvm-project/pull/139605