[clang] [Clang][Driver][NFC] Capture -foffload-lto Arg before dereferencing (PR #181752)

[Joseph Huber via cfe-commits]

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@@ -5233,23 +5233,19 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("-emit-llvm-uselists");
 
     if (IsUsingLTO) {
+      Arg *OffloadLTO = Args.getLastArg(options::OPT_foffload_lto,
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jhuber6 wrote:

Is this just for error handling? Do we have a test for this? Could just use `getLastArgValue`? That takes a default I believe so it would be sound if this was not passed.

https://github.com/llvm/llvm-project/pull/181752