Revert my previous patch to make the valgrind bots happy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121461 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCDisassembler/EDDisassembler.cpp b/lib/MC/MCDisassembler/EDDisassembler.cpp
index 2fd14db..697b3d9 100644
--- a/lib/MC/MCDisassembler/EDDisassembler.cpp
+++ b/lib/MC/MCDisassembler/EDDisassembler.cpp
@@ -354,7 +354,7 @@
   
   SourceMgr sourceMgr;
   sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
-  MCContext context(*AsmInfo, NULL);
+  MCContext context(*AsmInfo);
   OwningPtr<MCStreamer> streamer(createNullStreamer(context));
   OwningPtr<MCAsmParser> genericParser(createMCAsmParser(*Tgt, sourceMgr,
                                                          context, *streamer,