Port 1e696896

Original Commit Message:

    It was used only with Register inputs, so we can replace its uses with
    the Registers themselves.

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

Change-Id: I6b325ccefd226c96de45a74068b1d02611a846cb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1892195Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#64677}