Use simpler version of llvm::sys::fs::create_directories.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201290 91177308-0d34-0410-b5e6-96231b3b80d8
Use simpler version of fs::create_directory.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201293 91177308-0d34-0410-b5e6-96231b3b80d8
There is no std namespace for standards-based attributes. Removing the scope qualifier and updating the only affected test case.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201294 91177308-0d34-0410-b5e6-96231b3b80d8