Do not visit the constant pool pointer frame slot.

TEST=cctest/test-api/Regress137496 --ignition
R=danno@chromium.org, mcilroy@chromium.org, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/1950623002
Cr-Commit-Position: refs/heads/master@{#36028}