Clarify which type "Label" refers to (generic vs X86)

src/IceAssemblerX86BaseImpl.h

Index: src/IceAssemblerX86BaseImpl.h
diff --git a/src/IceAssemblerX86BaseImpl.h b/src/IceAssemblerX86BaseImpl.h
index 2f9cda8c027553d1f871580d3a5d925635e867c6..a042adf39a166bab158e80310849c7ebf1f72f92 100644
--- a/src/IceAssemblerX86BaseImpl.h
+++ b/src/IceAssemblerX86BaseImpl.h
@@ -70,6 +70,12 @@ Label *AssemblerX86Base<Machine>::getOrCreateLabel(SizeT Number,
 }
 
 template <class Machine>
+LabelBase *AssemblerX86Base<Machine>::getCfgNodeLabel(SizeT NodeNumber) {
+  assert(NodeNumber < CfgNodeLabels.size());
+  return CfgNodeLabels[NodeNumber];
+}
+
+template <class Machine>
 Label *AssemblerX86Base<Machine>::getOrCreateCfgNodeLabel(SizeT NodeNumber) {
   return getOrCreateLabel(NodeNumber, CfgNodeLabels);
 }