PR10323 Some ustack exelib.exp tests fail with prelinked shared libs.

For shared libraries (.dynamic sections) we need the eh frame section
address offset. This is the sh_addr if the shared library isn't prelinked
(since the base load address is zero in that case), otherwise it is
the module start address minus the bias (which also works for the
non-prelinked case).

* translate.cxx (get_unwind_data): Adjust eh_addr for module start and
  bias if module isn't absolute (has no relocations).
* testsuite/systemtap.exelib/ustack.tcl: Accept all prelink tests.

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