Fix use of uninitialized variable in r338299

llvm-svn: 338321
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 8dca6f1..5be6fb3 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -989,9 +989,9 @@
     EltTys.push_back(DBuilder.createMemberType(
         Unit, "__descriptor", nullptr, LineNo, FieldSize, FieldAlign, FieldOffset,
         llvm::DINode::FlagZero, DescTy));
+    FieldOffset += FieldSize;
   }
 
-  FieldOffset += FieldSize;
   Elements = DBuilder.getOrCreateArray(EltTys);
 
   // The __block_literal_generic structs are marked with a special