[PATCH] Introduce Target::createNullTargetStreamer and use it from IRObjectFile.

[Rafael Ávila de Espíndola]

With this TargetRegistry::RegisterNullStreamer becomes redundant, no? It will always be llvm::createNullStreamer + the new hook.

If so, please add a FIXME about it.


================
Comment at: include/llvm/Support/TargetRegistry.h:465
@@ +464,3 @@
+        return NullTargetStreamerCtorFn(S);
+      return 0;
+    }
----------------
nullptr

http://reviews.llvm.org/D7711

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