[PATCH] Enable layering check in unavailable modules

[Daniel Jasper]

  Now with context.

Hi rsmith, klimek,

http://llvm-reviews.chandlerc.com/D2442

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2442?vs=6189&id=6208#toc

Files:
  include/clang/Lex/ModuleMap.h
  include/clang/Lex/Preprocessor.h
  lib/Lex/ModuleMap.cpp
  lib/Lex/PPDirectives.cpp
  test/Modules/Inputs/declare-use/module.map
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