[llvm] [SandboxIR] Implement ConstantExpr (PR #109491)

[Sriraman Tallam via llvm-commits]

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@@ -1661,6 +1663,19 @@ class ConstantPtrAuth final : public Constant {
   }
 };
 
+class ConstantExpr : public Constant {
+  ConstantExpr(llvm::ConstantExpr *C, Context &Ctx)
+      : Constant(ClassID::ConstantExpr, C, Ctx) {}
+  friend class Context; // For constructor.
+
+public:
+  /// For isa/dyn_cast.
+  static bool classof(const sandboxir::Value *From) {
+    return From->getSubclassID() == ClassID::ConstantExpr;
+  }
+  // TODO: Missing functions.
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tmsri wrote:

Why not add the missing functions or a subset that is needed for now?  How is this useful?

https://github.com/llvm/llvm-project/pull/109491