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Again --prof-exec have bit-rotted a little with all the recent changes to the structure of the generated code. This patch contains a few improvements: - Repalce the eval/evl_loop begin/end events with generic section_push/section_pop events, that can be arbitrarily sprinkled into the generate code (so long as they are matched correctly) to measure various sections. The report then contains a nested profile of the sections, and the VCD trace shows the section names. - Better handling of exec graphs - Clearer overall statistics