Fix r276380 for targets without REALPATH.

This was a mistake in the layout of the code from r276380.  I moved the appropriate lines out of the #ifdef to fix it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276382 91177308-0d34-0410-b5e6-96231b3b80d8

tools/dsymutil/DwarfLinker.cpp

@@ -1641,14 +1641,14 @@ PointerIntPair<DeclContext *, 1> DeclContextTree::getChildDeclContext(
             if (!ResolvedPath.empty()) {
               FileRef = ResolvedPath;
             } else {
-#ifdef HAVE_REALPATH
               std::string File;
               bool gotFileName =
                 LT->getFileNameByIndex(FileNum, "",
                         DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
                         File);
               (void)gotFileName;
               assert(gotFileName && "Must get file name from line table");
+#ifdef HAVE_REALPATH
               char RealPath[PATH_MAX + 1];
               RealPath[PATH_MAX] = 0;
               if (::realpath(File.c_str(), RealPath))