[LLVM][NFC] Adding an Alignment type to LLVM
Summary:
This patch introduces a type to straighten LLVM's alignment management.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
The next step is to use this type throughout LLVM
Reviewers: jfb, jakehehrlich
Subscribers: mgorny, mgrang, dexonsmith, llvm-commits, courbet
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D64790
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367393 91177308-0d34-0410-b5e6-96231b3b80d8