PPC/s390: [liftoff] Add initial logic for stepping

Port 83ff405b

Original Commit Message:

    Flood functions with breakpoints to prepare them for stepping. With a
    small modification to the runtime function, this already implements a
    basic step over functionality.

    We still cannot resume, step in or step out (including stepping over a
    return instruction).

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

Change-Id: Id153b2611c528e679e8d7722e3d209fb15bcf6d1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2105055Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#66724}

test/inspector/inspector.status

@@ -73,6 +73,7 @@
   'debugger/wasm-scope-info': [SKIP],
   'debugger/wasm-scope-info-liftoff': [SKIP],
   'debugger/wasm-set-breakpoint-liftoff': [SKIP],
+  'debugger/wasm-stepping-liftoff': [SKIP],
 }],  # 'arch == ppc or arch == ppc64'
 
 ##############################################################################
@@ -83,6 +84,7 @@
   'debugger/wasm-scope-info': [SKIP],
   'debugger/wasm-scope-info-liftoff': [SKIP],
   'debugger/wasm-set-breakpoint-liftoff': [SKIP],
+  'debugger/wasm-stepping-liftoff': [SKIP],
 }],  # 'arch == s390 or arch == s390x'
 
 ##############################################################################