Refactor file/directory path in namespace debug info to refer directly to the pair rather than the DIFile

(paired to a Clang test - excuse the buildbot skew/fallout)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177566 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/DIBuilder.cpp

@@ -984,7 +984,7 @@ DINameSpace DIBuilder::createNameSpace(DIDescriptor Scope, StringRef Name,
                                        DIFile File, unsigned LineNo) {
   Value *Elts[] = {
     GetTagConstant(VMContext, dwarf::DW_TAG_namespace),
-    File,
+    File.getFileNode(),
     getNonCompileUnitScope(Scope),
     MDString::get(VMContext, Name),
     ConstantInt::get(Type::getInt32Ty(VMContext), LineNo)