In PrintCode, keep the debug_name string alive for all uses.
In PrintCode, keep the debug_name string alive for all uses.

BUG=chromium:465645
LOG=n
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/996663002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27099}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh