With modules we start accessing headers for the first time while reading
the module map, which often has very different paths from the include
scanning logic.

Using the name by which the file was accessed gets us one step closer to
the right solution, which is using a FileName abstraction that decouples
the name by which a file was accessed from the FileEntry.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@215541 91177308-0d34-0410-b5e6-96231b3b80d8