[PATCH] Some infrastructure work for virtual file system (now on phab)

[Ben Langmuir]

    - Add assert(FD >=0) and fix 80-column violations

Hi doug.gregor, klimek, gribozavr,

http://llvm-reviews.chandlerc.com/D2745

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2745?vs=7140&id=7141#toc

Files:
  include/clang/Basic/FileManager.h
  include/clang/Basic/FileSystemStatCache.h
  include/clang/Basic/VirtualFileSystem.h
  include/clang/Frontend/CompilerInstance.h
  lib/Basic/CMakeLists.txt
  lib/Basic/FileManager.cpp
  lib/Basic/FileSystemStatCache.cpp
  lib/Basic/VirtualFileSystem.cpp
  lib/Frontend/ASTUnit.cpp
  lib/Frontend/CacheTokens.cpp
  lib/Frontend/ChainedIncludesSource.cpp
  lib/Frontend/CompilerInstance.cpp
  lib/Frontend/FrontendAction.cpp
  lib/Lex/PTHLexer.cpp
  unittests/Basic/FileManagerTest.cpp
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