This extends --trace-block-coverage to output not only all raw coverage
slots, but also a detailed trace of all information that is generated by
coverage collection (i.e. after filtering and transforming collected
counts and ranges).

Example output:

Coverage for function='GetCoverage', SFI=0x3d23ea6dfb59,
has_nonempty_source_range=1, function_is_relevant=1
{start: 278, end: 441, count: 1}
{start: 357, end: 440, count: 0}

Bug: v8:6000,v8:9212
Change-Id: Ide09eb40999541df97409d0682a505ee0070b3a6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1771777
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63437}