Unwind across intrframes as well. While here, better handle bottom of stack by claiming the frame when the IP is 0. It's a bit of a kluge, but avoids screens full of bogus frames.
Unwind across intrframes as well. While here, better handle bottom of
stack by claiming the frame when the IP is 0. It's a bit of a kluge,
but avoids screens full of bogus frames.

MFC after: 1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase