[clang] [flang] [Flang][Driver] Introduce -fopenmp-targets offloading option (PR #100152)

[Michael Kruse via cfe-commits]

================
@@ -492,6 +493,18 @@ void Flang::addOffloadOptions(Compilation &C, const InputInfoList &Inputs,
     if (Args.hasArg(options::OPT_nogpulib))
       CmdArgs.push_back("-nogpulib");
   }
+
+  // For all the host OpenMP offloading compile jobs we need to pass the targets
+  // information using -fopenmp-targets= option.
+  if (JA.isHostOffloading(Action::OFK_OpenMP)) {
+    SmallString<128> Targets("-fopenmp-targets=");
----------------
Meinersbur wrote:

```suggestion
    StringRef Targets("-fopenmp-targets=");
```
This is never modified, `SmallString` would be beneficial when using `append`.

https://github.com/llvm/llvm-project/pull/100152