[PATCH] Allow string literals as module identifiers

[Daniel Jasper]

  Addressed Richard's comments.

Hi rsmith, doug.gregor, klimek,

http://llvm-reviews.chandlerc.com/D2024

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2024?vs=5154&id=5172#toc

Files:
  docs/Modules.rst
  include/clang/Basic/DiagnosticLexKinds.td
  lib/Lex/ModuleMap.cpp
  lib/Lex/PPDirectives.cpp
  lib/Lex/Preprocessor.cpp
  test/Modules/Inputs/declare-use/h.h
  test/Modules/Inputs/string_names/a.h
  test/Modules/Inputs/string_names/b.h
  test/Modules/Inputs/string_names/c.h
  test/Modules/Inputs/string_names/module.map
  test/Modules/Inputs/string_names/sub.h
  test/Modules/declare-use1.cpp
  test/Modules/declare-use2.cpp
  test/Modules/string_names.cpp
  test/Modules/string_names.m
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