ppc64: [baseline] implement JumpIfRoot and JumpIfSmi

Change-Id: I892e94d465eb9bcea64eefbcccc99b48c4dd444a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3542986


Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79558}