[PATCH] Correctly mark first token in the presence of UTF-8 BOM.

[Alexander Kornienko]

  I've just checked: getFileOffset calls from WhitespaceManager come in pairs for calculating the length of some ranges. Constant offset shouldn't affect anything there.

http://llvm-reviews.chandlerc.com/D2159

BRANCH
  svn

ARCANIST PROJECT
  clang