Reland "ppc: [liftoff] implement DropStackSlotsAndRet"

This is a reland of d7c9b31a

Original change's description:
> ppc: [liftoff] implement DropStackSlotsAndRet
>
> Change-Id: I05bcba3ad27b46b7c7888940895605ad463fc960
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3155302
> Reviewed-by: Milad Fa <mfarazma@redhat.com>
> Commit-Queue: Junliang Yan <junyan@redhat.com>
> Cr-Commit-Position: refs/heads/main@{#76774}

Change-Id: Ifced82af6fdd16c72d36493afa27f4a4824ada90
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3216041Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#77379}

src/wasm/baseline/ppc/liftoff-assembler-ppc.h

@@ -2742,7 +2742,8 @@ void LiftoffAssembler::RecordSpillsInSafepoint(Safepoint& safepoint,
 }
 
 void LiftoffAssembler::DropStackSlotsAndRet(uint32_t num_stack_slots) {
-  bailout(kUnsupportedArchitecture, "DropStackSlotsAndRet");
+  Drop(num_stack_slots);
+  Ret();
 }
 
 void LiftoffAssembler::CallC(const ValueKindSig* sig,