Make OnDiskChainedHashTableGenerator's Bucket type a POD type and reorder fields to optimize padding

For the common case of offset_type=unsigned this brings Bucket from 24 to 16
bytes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234692 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed