Squashed 'third_party/boostorg/static_assert/' content from commit afe9e9d

Change-Id: Ifc70a7a9eec39aeeeddb499da8ec8aad4c632432
git-subtree-dir: third_party/boostorg/static_assert
git-subtree-split: afe9e9d7864e23d50077115d51fa8ce17fc2e8be
22 files changed