ppc: [liftoff] implement DropStackSlotsAndRet

Change-Id: I05bcba3ad27b46b7c7888940895605ad463fc960
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3155302Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#76774}

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

@@ -2410,7 +2410,8 @@ 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,