Try to fix uninitialized read in unit test.

llvm-svn: 305753
diff --git a/llvm/unittests/DebugInfo/CodeView/RandomAccessVisitorTest.cpp b/llvm/unittests/DebugInfo/CodeView/RandomAccessVisitorTest.cpp
index d763bb3..9213451 100644
--- a/llvm/unittests/DebugInfo/CodeView/RandomAccessVisitorTest.cpp
+++ b/llvm/unittests/DebugInfo/CodeView/RandomAccessVisitorTest.cpp
@@ -360,6 +360,7 @@
   Class.Name = "FooClass";
   Class.Options = ClassOptions::None;
   Class.MemberCount = 0;
+  Class.Size = 4U;
   Class.DerivationList = TypeIndex::fromArrayIndex(0);
   Class.FieldList = TypeIndex::fromArrayIndex(0);
   Class.VTableShape = TypeIndex::fromArrayIndex(0);