[PATCH v4 1/4] perf annotate: Compute average IPC and IPC coverage per symbol

Add support to perf report annotate view or perf annotate --stdio2 to aggregate the IPC derived from timed LBRs per symbol. We compute the average IPC and the IPC coverage percentage. For example, $ perf annotate --stdio2 Percent IPC Cycle (Average IPC: 2.30, IPC Coverage: 54.8%)

[PATCH v4 1/4] perf annotate: Compute average IPC and IPC coverage per symbol

Add support to perf report annotate view or perf annotate --stdio2 to aggregate the IPC derived from timed LBRs per symbol. We compute the average IPC and the IPC coverage percentage. For example, $ perf annotate --stdio2 Percent IPC Cycle (Average IPC: 2.30, IPC Coverage: 54.8%)