Do not do field type tracking with GC stress.
Do not do field type tracking with GC stress.

R=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/718393004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25355}

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