Simplify EmitLabel.

All the "real" streamers were already calling to MCStreamer::EmitLabel
to do part of the work.

llvm-svn: 211646
diff --git a/llvm/lib/LTO/LTOModule.cpp b/llvm/lib/LTO/LTOModule.cpp
index 50ddaa1..05c384d 100644
--- a/llvm/lib/LTO/LTOModule.cpp
+++ b/llvm/lib/LTO/LTOModule.cpp
@@ -653,7 +653,7 @@
           AddValueSymbols(Inst.getOperand(i).getExpr());
     }
     void EmitLabel(MCSymbol *Symbol) override {
-      Symbol->setSection(*getCurrentSection().first);
+      MCStreamer::EmitLabel(Symbol);
       markDefined(*Symbol);
     }
     void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override {