Re-add hack that caused regression.

This fixes llvm.org/PR15350.

Before:
Constructor(int Parameter = 0)
    : aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaa),
                aaaaaaaaaaaa(aaaaaaaaaaaaaaaaa) {}

After:
Constructor(int Parameter = 0)
    : aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaa),
      aaaaaaaaaaaa(aaaaaaaaaaaaaaaaa) {}

I think the correct solution is to put the VariablePos into
ParenState, not LineState. Added FIXME.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176027 91177308-0d34-0410-b5e6-96231b3b80d8