[cpu-profiler] Expose parent pointer in a CpuProfileNode
Consumers can use this to derive the full stack from sampled leaf nodes without having to flatten the tree. Bug: v8:8999 Change-Id: I42c638dd2c757837b0c03514c204be0182653291 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1525877Reviewed-by: Peter Marshall <petermarshall@chromium.org> Reviewed-by: Alexei Filippov <alph@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Peter Marshall <petermarshall@chromium.org> Cr-Commit-Position: refs/heads/master@{#60309}
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