[PATCH] pr21217 - -fmodule-map-file should warn on non-existent file

[John Thompson]

Sean, thanks for adding Daniel.

Daniel, thanks for the review.  I've updated accordingly per your comments.  But note that I had to have at least one include in the test, or the check is not performed.  It seems like this should be okay, since any code using modules will have some include or import.  Otherwise I would need to do the check earlier when options are processed.

http://reviews.llvm.org/D6324

Files:
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticLexKinds.td
  lib/Lex/HeaderSearch.cpp
  test/Modules/pr21217.cpp
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