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

[John Thompson]

Moved loading of -fmodule-map-file files to HeaderSearch initialization in Preprocessor initialization.
Changed diagnostic to an error.

http://reviews.llvm.org/D6324

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