llvm-mc: Simplify EmitAssignment ('.set' is identical to '=').

llvm-svn: 80577
diff --git a/llvm/lib/MC/MCNullStreamer.cpp b/llvm/lib/MC/MCNullStreamer.cpp
index d4ca3d9..9ccea04 100644
--- a/llvm/lib/MC/MCNullStreamer.cpp
+++ b/llvm/lib/MC/MCNullStreamer.cpp
@@ -34,8 +34,7 @@
 
     virtual void EmitAssemblerFlag(AssemblerFlag Flag) {}
 
-    virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
-                                bool MakeAbsolute = false) {}
+    virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value) {}
 
     virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute) {}