Speed these tests up quite significantly by using the SB API instead of...

Speed these tests up quite significantly by using the SB API instead of running the "continue" command at each step
The reason why one mechanism is so much faster than the other (as in, ~10 seconds vs. ~1 minute) is quite baffling to me at the moment, but these are not process handling tests, so do what's faster

llvm-svn: 226730