First step to make the test suite runnable for remote platforms.

For the types directory, we were running lldbtest.system() to execute the compiled program
on the test host to collect golden output in order to compare with the output of various
lldb debugger commands as performed later.  This won't work for the remote platform
scenario where the architecture of the target and host platforms are different.

Modify the AbstractBase class to use lldb to launch the inferior while specifying the
output file, from which the golden output is collected and grokked.  How to bootstrap and
to connect to the remote platform is still being worked at.

llvm-svn: 154699