Revert of PPC/s390: [debugger] remove debugger statement support from FCG/CS. (patchset #1 id:1 of https://codereview.chromium.org/2672813002/ )

Reason for revert:
Original CL got reverted https://codereview.chromium.org/2672823007

Original issue's description:
> PPC/s390: [debugger] remove debugger statement support from FCG/CS.
>
> Port eef855a1
>
> R=yangguo@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
> BUG=
> LOG=N
>
> Review-Url: https://codereview.chromium.org/2672813002
> Cr-Commit-Position: refs/heads/master@{#42898}
> Committed: https://chromium.googlesource.com/v8/v8/+/f2d2ebcae8f31a7787778c429018156a432662e2

TBR=joransiu@ca.ibm.com,jyan@ca.ibm.com,michael_dawson@ca.ibm.com,yangguo@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Review-Url: https://codereview.chromium.org/2677183003
Cr-Commit-Position: refs/heads/master@{#42972}