[PATCH] Add support for foreach macros to clang-format

[David Majnemer]

  Here is a small subset of such macros to give you an example:
  list_for_each_cookie
  list_for_each_entry
  list_for_each_entry_continue
  list_for_each_entry_continue_rcu
  list_for_each_entry_continue_reverse
  list_for_each_entry_from
  list_for_each_entry_rcu
  list_for_each_entry_reverse
  list_for_each_entry_safe
  list_for_each_entry_safe_continue
  list_for_each_entry_safe_from
  list_for_each_entry_safe_reverse
  list_for_each_from
  list_for_each_prev
  list_for_each_prev_safe
  list_for_each_safe
  list_for_each_xattr
  radix_tree_for_each_chunk
  radix_tree_for_each_chunk_slot
  radix_tree_for_each_contig
  radix_tree_for_each_slot
  radix_tree_for_each_tagged

  I used the following to find these:
  git grep for_each | grep define | grep -P "\w+_for_each\w+" -o | sort -u

  That macro gave me no false positives.

http://llvm-reviews.chandlerc.com/D2919