perf/urgent fixes:

- Fix determination of a callchain node's childlessness in
  the top/report TUI, which was preventing navigating some
  callchains, --stdio unnaffected (Andres Freund)

- Fix jitdump's genelf assumption that PowerPC is big endian
  only (Anton Blanchard)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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