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

[Shunsuke Watanabe via cfe-commits]

================
@@ -595,6 +595,30 @@ void Flang::addOffloadOptions(Compilation &C, const 
InputInfoList &Inputs,
   addOpenMPHostOffloadingArgs(C, JA, Args, CmdArgs);
 }
 
+static std::string ComplexRangeKindToStr(LangOptions::ComplexRangeKind Range) {
+  switch (Range) {
+  case LangOptions::ComplexRangeKind::CX_Full:
+    return "full";
+    break;
+  case LangOptions::ComplexRangeKind::CX_Improved:
+    return "improved";
+    break;
+  case LangOptions::ComplexRangeKind::CX_Basic:
+    return "basic";
+    break;
+  default:
+    return "";
+  }
+}
+
+static std::string
+RenderComplexRangeOption(LangOptions::ComplexRangeKind Range) {
+  std::string ComplexRangeStr = ComplexRangeKindToStr(Range);
+  if (!ComplexRangeStr.empty())
+    return "-complex-range=" + ComplexRangeStr;
+  return ComplexRangeStr;
+}
+
----------------
s-watanabe314 wrote:

I moved both functions to `CommonArgs.cpp` and removed them from `Clang.cpp` 
and `Flang.cpp`.

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