[wasm][debug] Always regenerate Liftoff debug code

If there is still Liftoff code installed on a function, we cannot reuse
it when tiering down, since we don't know if it was compiled with
debugging capabilities. This made the "debug-step-into-wasm" test flake.

R=thibaudm@chromium.org

Bug: v8:10368
Change-Id: I3672940015c85ec10ead2e33e7792410b47589d4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2135732Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66993}

src/wasm/module-compiler.cc

@@ -2545,14 +2545,16 @@ void CompilationStateImpl::InitializeRecompilation(
         DCHECK_LT(slot_index, compilation_progress_.size());
         ExecutionTier reached_tier =
             ReachedTierField::decode(compilation_progress_[slot_index]);
+        // Ignore Liftoff code, since we don't know if it was compiled with
+        // debugging support.
+        // TODO(clemensb): Introduce {kLiftoffDebug} as a separate tier.
         bool has_correct_tier =
-            reached_tier == tier &&
+            tier == ExecutionTier::kTurbofan && reached_tier == tier &&
             native_module_->HasCodeWithTier(function_index, tier);
+        if (!has_correct_tier) {
           compilation_progress_[slot_index] =
               ReachedRecompilationTierField::update(
-                compilation_progress_[slot_index],
-                has_correct_tier ? tier : ExecutionTier::kNone);
-        if (!has_correct_tier) {
+                  compilation_progress_[slot_index], ExecutionTier::kNone);
           outstanding_recompilation_functions_++;
           builder.AddRecompilationUnit(function_index, tier);
         }