[Bug testsuite/18577] on rhel7, listing_mode_sanity.exp always gets a failure when doing 'stap -l **'

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18577

--- Comment #2 from David Smith <dsmith at redhat dot com> ---
So, I compiled everything with '-pg' to enable profiling with grpof. Running
"stap -l '**'" took ~2.5 hours with profiling enabled. Here's the top of the
gprof output:

====
Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls   s/call   s/call  name    
 49.45    250.48   250.48 120081098     0.00     0.00  levenshtein(std::string
const&, std::string const&)
 22.85    366.22   115.74    21077     0.01     0.02 
levenshtein_suggest(std::string const&, std::set<std::string,
std::less<std::string>, std::allocator<std::string> > const&, unsigned int,
unsigned int)
  7.19    402.66    36.44        1    36.44    43.34 
semantic_pass_conditions(systemtap_session&)
====

It looks like we need to look at how we are using the levenshtein functions
(which suggest alternatives), since between the 2 functions they took ~72% of
the execution time.

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