NFCI, optimize layout of FileEntry
NFCI, optimize layout of FileEntry

The reordering of the UID field makes the size of a
FileEntry 8 bytes smaller on 64bit platforms.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@367371 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang