[llvm] [Local] Move OverflowTracking to Local.h, move logic to helpers (NFC) (PR #140403)

[Florian Hahn via llvm-commits]

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@@ -556,6 +556,27 @@ Value *invertCondition(Value *Condition);
 /// function, explicitly materialize the maximal set in the IR.
 bool inferAttributesFromOthers(Function &F);
 
+//===----------------------------------------------------------------------===//
+//  Helpers to track and update flags on instructions.
+//
+
+struct OverflowTracking {
+  bool HasNUW = true;
+  bool HasNSW = true;
+  bool AllKnownNonNegative = true;
+  bool AllKnownNonZero = true;
+  // Note: AllKnownNonNegative can be true in a case where one of the operands
+  // is negative, but one the operators is not NSW. AllKnownNonNegative should
+  // not be used independently of HasNSW
+  OverflowTracking() = default;
+
+  /// Merge in the no-wrap flags from \p I.
+  void mergeFlags(Instruction &I);
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fhahn wrote:

Will share a separate patch for that, thanks

https://github.com/llvm/llvm-project/pull/140403