Unify unix and windows versions of FileManager::UniqueDirContainer and FileManager::UniqueFileContainer

[Rafael Espíndola]

This started with what I assumed would be a trivial patch to use
llvm::sys::fs::UniqueID instead of using st_dev and st_ino directly.

Unfortunately, we are passing a stat buffer through most of the file
manager, so the patch got somewhat verbose.

We cannot also just replace "struct stat" with
llvm::sys::fs::file_status, since we want to be able to construct fake
ones, and file_status has different members on unix and windows.

What the patch does is:

* Record only the information that clang is actually using.
* Use llvm::sys::fs::status instead of stat and fstat.
* Use llvm::sys::fs::UniqueID
* Delete the old windows versions of UniqueDirContainer and
UniqueFileContainer since the "unix" one now works on windows too.

Since the use of dev/inode has reached libclang, I have also patched
llvm to make it clear that
UniqueID has device and file components instead of being made of
arbitrary 128 bits.

Cheers,
Rafael
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