Fix the last two warnings I see on Linx building 'lldb': mismatched

signed and unsigned types in comparisons.

For the text offset, use the addr_t type that is used elsewhere to get
these kinds of offsets, and which it is being compared against. This
seems to make things more consistent.

For the other, the numbers are clearly small and uninteresting, so just
cast them to the most boring 'int' type.

llvm-svn: 229085