[llvm] [SandboxIR][NFC] GenericSetter tracker class (PR #102260)

[Arthur Eubanks via llvm-commits]

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@@ -687,7 +689,10 @@ void LoadInst::dump() const {
 void StoreInst::setVolatile(bool V) {
   auto &Tracker = Ctx.getTracker();
   if (Tracker.isTracking())
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aeubanks wrote:

we might even be able to factor out `if (Tracker.isTracking())` somehow with another helper method. but maybe that's not good for consistency with the other trackers that don't use `GenericSetter`

https://github.com/llvm/llvm-project/pull/102260