clang-format: Don't force line breaks in ObjC calls with ColumnLimit 0.

Before:
  [self.x a:b c:d];

Got reformatted toi (with ColumnLimit set to 0):
  [self.x a:b
          c:d];

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@209114 91177308-0d34-0410-b5e6-96231b3b80d8