[llvm] [OFFLOAD] Stricter enforcement of user offload disable (PR #133470)

[Joseph Huber via llvm-commits]

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@@ -31,6 +32,12 @@ void initRuntime() {
   if (PM == nullptr)
     PM = new PluginManager();
 
+  if (OffloadPolicy::isOffloadDisabled()) {
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jhuber6 wrote:

Well, there's possibly entrypoint into `libomptarget`. I'm wondering what this does in that case. I suppose this keeps it from being `null` and potentially crashing, but it might be invalid since it's not initialized.

https://github.com/llvm/llvm-project/pull/133470