MC: Initialize MCFragment::Offset, noticed by Cameron Esfahani.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109875 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index b24c8ca..2512a81 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -182,7 +182,8 @@
 }
 
 MCFragment::MCFragment(FragmentType _Kind, MCSectionData *_Parent)
-  : Kind(_Kind), Parent(_Parent), Atom(0), EffectiveSize(~UINT64_C(0))
+  : Kind(_Kind), Parent(_Parent), Atom(0), Offset(~UINT64_C(0)),
+    EffectiveSize(~UINT64_C(0))
 {
   if (Parent)
     Parent->getFragmentList().push_back(this);