Fixup unit tests for DiagnosticOptions change

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166509 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Lex/LexerTest.cpp b/unittests/Lex/LexerTest.cpp
index 069b3cc..593fdb5 100644
--- a/unittests/Lex/LexerTest.cpp
+++ b/unittests/Lex/LexerTest.cpp
@@ -31,7 +31,7 @@
   LexerTest()
     : FileMgr(FileMgrOpts),
       DiagID(new DiagnosticIDs()),
-      Diags(DiagID, new IgnoringDiagConsumer()),
+      Diags(DiagID, new DiagnosticOptions, new IgnoringDiagConsumer()),
       SourceMgr(Diags, FileMgr),
       TargetOpts(new TargetOptions) 
   {