Fix loop-level instrumentation + more

[jrmadsen]

• fix loop-level instrumentation
  • Closes Loop instrumentation option does not appear to be instrumenting loops #21
• support loop instrumentation w/o debug symbols via loop number
• improve module_function messages
• serialize num_basic_blocks
• serialize num_outer_loops
• serialize is_num_instructions_constrained
• serialize is_loop_num_instructions_constrained
• updated transpose example to use uniform_int_distribution
  • this resulted in a speedup of ~2x
  • instrumentation was slowed down significantly in binary rewrite due to instrumentation of uniform_int_distribution::operator() and thus tests using transpose exe use -E uniform_int_distribution
• added transpose loop test
• added fail regexes for tests which enable loop instrumentation
• replace module->getName with module->getFullName in:
  • get_loop_file_line_info(...) in details.cpp
  • get_func_file_line_info(...) in details.cpp
  • get_basic_block_file_line_info(...) in details.cpp

Issue with loop-level instrumentation was due to _is_constrained lambda testing for _v == false after being passed _points == 0 instead of _v == true:

        auto _is_constrained = [this](bool _v, const std::string& _label) {
            if(!_v)
            {
                messages.emplace_back(3, "Skipping", "function", _label);
                return true;
            }
            return false;
        };


        size_t _points             = 0;
        size_t _ntraps             = 0;
        std::tie(_points, _ntraps) = query_instr(function, BPatch_entry, flow_graph, itr);

        if(_is_constrained(_points == 0, "no-instrumentable-loop-entry-point")) continue;

Effectively, since there _points was always > 0, this resulted in _is_constrained always returning true.