Use 'unsigned char' to get this past gcc error message:

  error: invalid conversion from 'unsigned char' to '{anonymous}::Sequence'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196004 91177308-0d34-0410-b5e6-96231b3b80d8
Use accessor methods instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196006 91177308-0d34-0410-b5e6-96231b3b80d8