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

[Tarun Prabhu via cfe-commits]

================
@@ -3409,3 +3409,30 @@ StringRef 
tools::parseMRecipOption(clang::DiagnosticsEngine &Diags,
 
   return Out;
 }
+
+std::string tools::ComplexRangeKindToStr(LangOptions::ComplexRangeKind Range) {
+  switch (Range) {
+  case LangOptions::ComplexRangeKind::CX_Full:
+    return "full";
+    break;
+  case LangOptions::ComplexRangeKind::CX_Basic:
+    return "basic";
+    break;
+  case LangOptions::ComplexRangeKind::CX_Improved:
+    return "improved";
+    break;
+  case LangOptions::ComplexRangeKind::CX_Promoted:
+    return "promoted";
+    break;
+  default:
+    return "";
+  }
+}
+
+std::string
+tools::RenderComplexRangeOption(LangOptionsBase::ComplexRangeKind Range) {
----------------
tarunprabhu wrote:

```suggestion
tools::renderComplexRangeOption(LangOptionsBase::ComplexRangeKind Range) {
```

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