[PATCH] Allow memory intrinsics to be tail calls

[Owen Anderson]

REPOSITORY
  rL LLVM

================
Comment at: lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:4598
@@ +4597,3 @@
+                               MachinePointerInfo(I.getArgOperand(1)));
+    if (MC.getNode() != nullptr)
+      DAG.setRoot(MC);
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This code sequence is repeated in a few places.  Could it be extracted (and commented)?

http://reviews.llvm.org/D8808

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