MC: Fix the MCNullStreamer which was broken in r147763.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151213 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCNullStreamer.cpp

@@ -95,6 +95,10 @@ namespace {
     virtual void EmitInstruction(const MCInst &Inst) {}
 
     virtual void FinishImpl() {}
+
+    virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
+      RecordProcEnd(Frame);
+    }
     
     /// @}
   };