[PATCH] Warn on malformed header guards

[Richard Trieu]

  Combine two if statements into one.

  Rename variables dealing with #ifndef so they are clearer and consistent.

http://llvm-reviews.chandlerc.com/D898

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D898?vs=2202&id=2369#toc

Files:
  test/Lexer/header.cpp
  test/Lexer/Inputs/out-of-order-define.h
  test/Lexer/Inputs/multiple.h
  test/Lexer/Inputs/bad-header-guard.h
  test/Lexer/Inputs/good-header-guard.h
  test/Lexer/Inputs/different-define.h
  test/Lexer/Inputs/no-define.h
  include/clang/Basic/DiagnosticLexKinds.td
  include/clang/Lex/MultipleIncludeOpt.h
  include/clang/Lex/Preprocessor.h
  include/clang/Lex/HeaderSearch.h
  lib/Lex/PPLexerChange.cpp
  lib/Lex/PPDirectives.cpp
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