Move [SU]LEB128 encoding to a utility header.

These functions are very generic. There's no reason for them to
be tied to MCObjectWriter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161545 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index 8329ce8..05519b5 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -27,6 +27,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/LEB128.h"
 
 using namespace llvm;
 
@@ -713,9 +714,9 @@
   Data.clear();
   raw_svector_ostream OSE(Data);
   if (LF.isSigned())
-    MCObjectWriter::EncodeSLEB128(Value, OSE);
+    encodeSLEB128(Value, OSE);
   else
-    MCObjectWriter::EncodeULEB128(Value, OSE);
+    encodeULEB128(Value, OSE);
   OSE.flush();
   return OldSize != LF.getContents().size();
 }