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In heatmap mode, report samples and utilization of the section(s) between hot text markers `[__hot_start, __hot_end)`. The intended use is with multi-way splitting where there are several sections that contain "hot" code (e.g. `.text.warm` with CDSplit). Addresses the comment on #139193 https://github.com/llvm/llvm-project/pull/139193#pullrequestreview-2835274682 Test Plan: updated heatmap-preagg.test