Implement new DEX PC lookup scheme.

GDB wasn't handling the old one gracefully.

- Create a RegsInfo structure that can be used to properly eval expression
  data.
- Remove the versions on Dwarf ops. It doesn't work the in the real world
  and doesn't add useful information.
- Fix dex pc frame number bug.

Test: testrunner.py -j40 --host --cdex-fast -t 137
Test: libunwindstack_test
Test: All unit tests pass.
Change-Id: Iac4fea651b81cb6087fd237a9a5027a352a49245