This had bit-rotten a little and did no longer work for compiling
webassembly code. Also, correct the output of live ranges so that it
can be parsed again.

Bug: v8:8238
Change-Id: I09c2d8bd604f3be12ead8b968f0b70287fad65f1
Reviewed-on: https://chromium-review.googlesource.com/c/1256864
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56373}