[PATCH] Modules: Error on missing header files only if a module is built/used.

[Daniel Jasper]

  Changed implementation as promised and updated description.

Hi klimek, rsmith, doug.gregor,

http://llvm-reviews.chandlerc.com/D2352

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2352?vs=5952&id=5982#toc

Files:
  include/clang/Basic/DiagnosticFrontendKinds.td
  include/clang/Basic/DiagnosticLexKinds.td
  include/clang/Basic/Module.h
  include/clang/Lex/ModuleMap.h
  lib/Basic/Module.cpp
  lib/Frontend/CompilerInstance.cpp
  lib/Frontend/FrontendActions.cpp
  lib/Lex/HeaderSearch.cpp
  lib/Lex/ModuleMap.cpp
  test/Modules/Inputs/submodules/module.map
  test/Modules/submodules.cpp
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