Fix formatting of long declarations with const type.

Before (exceeding the column limit):
LoooooooooooooooooooooooooooooooooooooooongType const LoooooooooooooooooooooooooooooooooooooooongVariable;

After:
LoooooooooooooooooooooooooooooooooooooooongType const
LoooooooooooooooooooooooooooooooooooooooongVariable;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185418 91177308-0d34-0410-b5e6-96231b3b80d8