[PATCH] Add function attribute 'optnone'

[Andrea Di Biagio]

  Hi Bill,

  The proposal didn't receive strong objections but nor did it receive a clear accept. The lack of proper feedback made it difficult to understand what to do next. A couple of colleagues discussed this at one of the last Bay-area socials; the consensus there was that sending a first patch for review would be a reasonable next-step since nobody really expressed strong objections on it.

  Thanks,
  Andrea Di Biagio

http://llvm-reviews.chandlerc.com/D1288