Port ed319e84

Original Commit Message:

    Failure addressed by not exposing the new test to the jitless environment.
    (jgruber@ on TBR).

    New enum RelocInfo::COMPRESSED_EMBEDDED_OBJECT created to support
    compressed pointers in generated code. Enum name EMBEDDED_OBJECT
    changed to FULL_EMBEDDED_OBJECT.

    RelocInfo::[set_]target_object() abstract away the difference between
    FULL_EMBEDDED_OBJECT and COMPRESSED_EMBEDDED_OBJECT.

    Compressed embedded objects can only be created at this time on
    x64 with pointer compression turned on. Arm64 constant pools don't
    support compressed objects at this time.

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

Change-Id: I8bdb5391fd2b2565d2fcaf6c806fcdbe1a1f27b2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1589862Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#61123}