Enable a path-sensitive memory leak analysis in autoTune for small programs

[mrstanb]

It'd be a nice option to be able to run the memLeak analysis with path-sensitivity in case we're dealing with small programs, since it wouldn't incur a large performance overhead, but it would improve precision in case we have to deal with a failing call to malloc, calloc, realloc and the like.

[michael-schwarz]

Yes, failing calls and (for Juliet in SV-COMP probably even more relevant), calls that only happen conditionally.