Reorder the DIFile field in DILexicalBlock to become a prefix common with other DIScopes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177703 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/IR/DIBuilder.cpp b/lib/IR/DIBuilder.cpp
index de01781..a97b740 100644
--- a/lib/IR/DIBuilder.cpp
+++ b/lib/IR/DIBuilder.cpp
@@ -1023,10 +1023,10 @@
   static unsigned int unique_id = 0;
   Value *Elts[] = {
     GetTagConstant(VMContext, dwarf::DW_TAG_lexical_block),
+    File,
     getNonCompileUnitScope(Scope),
     ConstantInt::get(Type::getInt32Ty(VMContext), Line),
     ConstantInt::get(Type::getInt32Ty(VMContext), Col),
-    File,
     ConstantInt::get(Type::getInt32Ty(VMContext), unique_id++)
   };
   DILexicalBlock R(MDNode::get(VMContext, Elts));