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

src/IceAssembler.h

Index: src/IceAssembler.h
diff --git a/src/IceAssembler.h b/src/IceAssembler.h
index d53a3be2b4e22bc0fd36c6f6ad116d3cd8517bee..7f5d909ed30215e46ac81595e035a203a478d047 100644
--- a/src/IceAssembler.h
+++ b/src/IceAssembler.h
@@ -249,7 +249,7 @@ public:
   virtual llvm::ArrayRef<uint8_t> getNonExecBundlePadding() const = 0;
 
   /// Get the label for a CfgNode.
-  virtual Label *getOrCreateCfgNodeLabel(SizeT NodeNumber) = 0;
+  virtual Label *getCfgNodeLabel(SizeT NodeNumber) = 0;
   /// Mark the current text location as the start of a CFG node
   /// (represented by NodeNumber).
   virtual void bindCfgNodeLabel(SizeT NodeNumber) = 0;