[clang] [clang][Driver][Darwin] Use `xcselect` for `*-apple-darwin*` targets too (PR #186683)

[Carlo Cabrera via cfe-commits]

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@@ -2651,6 +2644,19 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
   const std::string OSVersionStr = OSVersion.getAsString();
   // Set the tool chain target information.
   if (Platform == MacOS) {
+#ifdef CLANG_USE_XCSELECT
+    // If we don't have an SDK yet and are on macOS, try to inject one using
+    // xcselect, except when passed --no-sysroot.
+    if (TryXcselect && !SDKInfo) {
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carlocab wrote:

Did this in e3868a14509c9ddc4f7785d230495335f4648f8f. Let me know if I misunderstood the suggestion.

https://github.com/llvm/llvm-project/pull/186683