PC sampling: chiplet id + integration test fix (#983)

* PCS: show chiplet; cover loading/unloading in integration test

* Use (code_object_id, pc_addr) pair as instruction id.

samples/pc_sampling/pcs.cpp

@@ -319,6 +319,8 @@ rocprofiler_pc_sampling_callback(rocprofiler_context_id_t /*context_id*/,
                    << "z=" << std::setw(5) << pc_sample->workgroup_id.z << "), "
                    << "wave_id: " << std::setw(2) << static_cast<unsigned int>(pc_sample->wave_id)
                    << ", "
+                   << "chiplet: " << std::setw(2) << static_cast<unsigned int>(pc_sample->chiplet)
+                   << ", "
                    << "cu_id: " << pc_sample->hw_id << ", "
                    << "correlation: {internal=" << std::setw(7)
                    << pc_sample->correlation_id.internal << ", "