[llvm] [SandboxIR] Implement remaining ConstantInt functions (PR #106775)

[Sriraman Tallam via llvm-commits]

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@@ -565,7 +565,7 @@ class Constant : public sandboxir::User {
 };
 
 class ConstantInt : public Constant {
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tmsri wrote:

Add TODO: that is must inherit from ConstantData

https://github.com/llvm/llvm-project/pull/106775