[clang] [flang] [flang] Add -fcomplex-arithmetic= option and select complex division algorithm (PR #146641)

[Tarun Prabhu via cfe-commits]

================
@@ -609,6 +609,17 @@ class FirOpBuilder : public mlir::OpBuilder, public 
mlir::OpBuilder::Listener {
     return integerOverflowFlags;
   }
 
+  /// Set ComplexDivisionToRuntimeFlag value for whether complex number 
division
+  /// is lowered to a runtime function by this builder.
----------------
tarunprabhu wrote:

NIT: It's probably not necessary to repeat what the flag does here. If you 
would prefer to keep it, consider rephrasing

```suggestion
  /// Set ComplexDivisionToRuntimeFlag value. If set to true, complex number
  /// division is lowered to a runtime function by this builder.
```

https://github.com/llvm/llvm-project/pull/146641
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