[llvm] [SCCP] Extend `visitBinaryOperator` to overflowing binary ops (PR #84470)

[Yingwei Zheng via llvm-commits]

================
@@ -1486,7 +1486,18 @@ void SCCPInstVisitor::visitBinaryOperator(Instruction &I) {
   // Try to simplify to a constant range.
   ConstantRange A = getConstantRange(V1State, I.getType());
   ConstantRange B = getConstantRange(V2State, I.getType());
-  ConstantRange R = A.binaryOp(cast<BinaryOperator>(&I)->getOpcode(), B);
+
+  auto *BO = cast<BinaryOperator>(&I);
+  ConstantRange R = ConstantRange::getEmpty(I.getType()->getScalarSizeInBits());
+  if (auto *OBO = dyn_cast<OverflowingBinaryOperator>(BO)) {
+    bool HasNUW = OBO->hasNoUnsignedWrap();
+    bool HasNSW = OBO->hasNoSignedWrap();
+    unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
+                     (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
----------------
dtcxzyw wrote:

Copied from `LazyValueInfoImpl::solveBlockValueBinaryOp`:
```suggestion
    unsigned NoWrapKind = 0;
    if (OBO->hasNoUnsignedWrap())
      NoWrapKind |= OverflowingBinaryOperator::NoUnsignedWrap;
    if (OBO->hasNoSignedWrap())
      NoWrapKind |= OverflowingBinaryOperator::NoSignedWrap;
```
Do we need a helper `OverflowingBinaryOperator::getNoWrapKind()`?



https://github.com/llvm/llvm-project/pull/84470