| Fix cumulative percentage calculation for recursive functions in the new |
| sampling profiler. When profiling recursive functions, cumulative statistics |
| (cumul%, cumtime) could exceed 100% because each recursive frame in a stack |
| was counted separately. For example, a function recursing 500 times in every |
| sample would show 50000% cumulative presence. The fix deduplicates locations |
| within each sample so cumulative stats correctly represent "percentage of |
| samples where this function was on the stack". Patch by Pablo Galindo. |
