[llvm] [IPSCCP] Variable not visible at Og: (PR #66745)

[Felipe de Azevedo Piovezan via llvm-commits]

================
@@ -371,6 +372,52 @@ static bool runIPSCCP(
       StoreInst *SI = cast<StoreInst>(GV->user_back());
       SI->eraseFromParent();
     }
+
+    // Try to create a debug constant expression for the glbal variable
+    // initializer value.
+    SmallVector<DIGlobalVariableExpression *, 1> GVEs;
+    GV->getDebugInfo(GVEs);
+    if (GVEs.size() == 1) {
+      DIBuilder DIB(M);
+
+      // Create integer constant expression.
+      auto createIntExpression = [&DIB](const Constant *CV) -> DIExpression * {
----------------
felipepiovezan wrote:

We can also pack this into a neat helper function to simplify the logic

https://github.com/llvm/llvm-project/pull/66745