perf c2c: add function view stats merge and memory management

Add the per-entry stats/cstats aggregation helpers and hierarchy teardown.
Child common fields are released through hist_entry__delete(), while the
function-view free callback handles the private child tree and containing
allocation. Also add a helper for pruning writer entries with no stores or
cacheline children.

These are used by the entry-creation and builder patches that follow and
are __maybe_unused until then.

Signed-off-by: Jiebin Sun <jiebin.sun@intel.com>
Reviewed-by: Tianyou Li <tianyou.li@intel.com>
Reviewed-by: Wangyang Guo <wangyang.guo@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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