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 5b853fdb2cc7cfa9c9fb358541df3ee080e9e0ac..9a439c267f8d67a4313e329fe794b5465fba827c 100644
--- a/src/IceAssemblerX86BaseImpl.h
+++ b/src/IceAssemblerX86BaseImpl.h
@@ -70,6 +70,12 @@ Label *AssemblerX86Base<Machine>::getOrCreateLabel(SizeT Number,
 }
 
 template <class Machine>
+Ice::Label *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);
 }