[llvm] [LVI][SCCP] Avoid copying ValueLatticeElement (PR #163901)

[Nikita Popov via llvm-commits]

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@@ -1996,7 +1991,7 @@ void SCCPInstVisitor::handleCallArguments(CallBase &CB) {
                        getMaxWidenStepsOpts());
         }
       } else
-        mergeInValue(&*AI,
+        mergeInValue(ValueState[&*AI], &*AI,
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nikic wrote:

This looks potentially unsafe, is `ValueState[&*AI]` guaranteed to already exist?

https://github.com/llvm/llvm-project/pull/163901