[clang] [CIR] Upstream DivOp for ComplexType (PR #153796)

[Andy Kaylor via cfe-commits]

================
@@ -3013,6 +3013,47 @@ def CIR_ComplexMulOp : CIR_Op<"complex.mul", [
   }];
 }
 
+def CIR_ComplexDivOp : CIR_Op<"complex.div", [
+  Pure, SameOperandsAndResultType
+]> {
+  let summary = "Complex division";
+  let description = [{
+    The `cir.complex.div` operation takes two complex numbers and returns
+    their quotient.
+
+    The `range` attribute is used to select the algorithm used when
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andykaylor wrote:

```suggestion
    For complex types with floating-point components, the `range` attribute specifies the algorithm to be used when
```

https://github.com/llvm/llvm-project/pull/153796