Revert alignment assumptions changes

Revert r351104-6, r351109, r351110, r351119, r351134, and r351153. These
changes fail on the sanitizer bots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351159 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed