There were two failure paths where the CodeProtectionInfo object would not be
freed. This adds a free() on those paths to prevent a memory leak.

Bug: v8:7434
Change-Id: I48d60aee3255d829bf39b51cc30fabaf76b1fb07
Reviewed-on: https://chromium-review.googlesource.com/927746Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Commit-Queue: Eric Holk <eholk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51408}