Add another (and hopefully the last) exception case, where once we recalculate

Add another (and hopefully the last) exception case, where once we recalculate
the alignment requirement, if it no longer makes the TType base offset overflow
into extra bytes, then we need to pad to those bytes ourselves.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97196 91177308-0d34-0410-b5e6-96231b3b80d8