Port c4d31fea

Original Commit Message:

    Stack limits were additionally maintained in pseudo-smi roots.
    "Pseudo", because we stored the raw limit pointers there, just making
    sure their values looked like smis by masking the least significant
    bits.

    This mechanism is no longer needed now that we can access the stack
    limit external references as efficiently as the smi roots.

R=jgruber@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ida5c1fe10a494e9c6d665425bd464228978ecd1b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1752142Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#63194}