[clang] [clang] fix divide by zero in ComplexExprEvaluator (PR #104666)

[Sergei Barannikov via cfe-commits]

================
@@ -15567,12 +15567,13 @@ bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
         HandleComplexComplexDiv(A, B, C, D, ResR, ResI);
       }
     } else {
-      if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0)
-        return Error(E, diag::note_expr_divide_by_zero);
-
       ComplexValue LHS = Result;
       APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() +
         RHS.getComplexIntImag() * RHS.getComplexIntImag();
+      if ((RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) ||
+          Den.isZero())
----------------
s-barannikov wrote:

(nit) The first part of the check implies the second, why not just
```suggestion
      if (Den.isZero())
```


https://github.com/llvm/llvm-project/pull/104666