Only include function ranges for with non-0 counts or if the immediate outer function has non-0 count.

R=caseq@chromium.org, jgruber@chromium.org
BUG=v8:5808

Review-Url: https://codereview.chromium.org/2764073004
Cr-Original-Commit-Position: refs/heads/master@{#44079}
Committed: https://chromium.googlesource.com/v8/v8/+/a7577ede0b74967727895eba5e06dbe1d01fb56d
Review-Url: https://codereview.chromium.org/2764073004
Cr-Commit-Position: refs/heads/master@{#44120}