Update docs for bitcode changes. For object size checking we won't

Update docs for bitcode changes. For object size checking we won't
work with partial objects so just count the type as a boolean. Update
appropriately.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91954 91177308-0d34-0410-b5e6-96231b3b80d8