Constantpool register is being used with no frame, and
    therefore it points to its parent stub's constantpool
    causing segfault.
    Disable constantpool before CallStub if frame not set.

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2106493002
Cr-Commit-Position: refs/heads/master@{#37300}