support icicle graph

[cathaysia]

somethimes iciclegraph is very useful, could you please consider add support it?

┆Issue is synchronized with this Jira Task

[canova]

Hi, we have a "stack chart" tab, which is a top down version flame graph, but with a chronological x-axis. Does the graph you want exactly the flame graph but upside down? Could you please elaborate on your need and how it is useful as oppose to the flame graph and stack chart?

[cathaysia]

When I analyze program, I often encounter many different bottoms, but the final function is the same. For example, function x is called by many places. At this time, x() will be separated. If iciclegraph is used, it will be aggregated together. I found the iciclegraph in vtune very useful in some cases

[cathaysia]

and here has a expain more details about the 'icicle graph'

https://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#5.5.%20NUMA%20Rebalancing:~:text=flame%20graph%0A%09%2D%2Dinverted%20%20%20%20%20%20%20%23-,icicle%20graph,-%5B..%5D