[wasm] Remove obsolete {WasmCode::kRuntimeStub}.

R=clemensh@chromium.org
BUG=v8:8519

Change-Id: I3c63637fb9cb694e4d50be2fded1dcc02de7f2ba
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1796559
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63676}

src/execution/frames.cc

@@ -553,14 +553,6 @@ StackFrame::Type StackFrame::ComputeType(const StackFrameIteratorBase* iterator,
           return WASM_EXIT;
         case wasm::WasmCode::kWasmToJsWrapper:
           return WASM_TO_JS;
-        case wasm::WasmCode::kRuntimeStub:
-          // Some stubs, like e.g. {WasmCode::kWasmCompileLazy} build their own
-          // specialized frame which already carries a type marker.
-          // TODO(mstarzinger): This is only needed for the case where embedded
-          // builtins are disabled. It can be removed once all non-embedded
-          // builtins are gone.
-          if (StackFrame::IsTypeMarker(marker)) break;
-          return STUB;
         case wasm::WasmCode::kInterpreterEntry:
           return WASM_INTERPRETER_ENTRY;
         default:

src/execution/isolate.cc

@@ -1763,16 +1763,10 @@ Object Isolate::UnwindAndFindHandler() {
         // Some stubs are able to handle exceptions.
         if (!catchable_by_js) break;
         StubFrame* stub_frame = static_cast<StubFrame*>(frame);
+#ifdef DEBUG
         wasm::WasmCodeRefScope code_ref_scope;
-        wasm::WasmCode* wasm_code =
-            wasm_engine()->code_manager()->LookupCode(frame->pc());
-        if (wasm_code != nullptr) {
-          // It is safe to skip Wasm runtime stubs as none of them contain local
-          // exception handlers.
-          CHECK_EQ(wasm::WasmCode::kRuntimeStub, wasm_code->kind());
-          CHECK_EQ(0, wasm_code->handler_table_size());
-          break;
-        }
+        DCHECK_NULL(wasm_engine()->code_manager()->LookupCode(frame->pc()));
+#endif  // DEBUG
         Code code = stub_frame->LookupCode();
         if (!code.IsCode() || code.kind() != Code::BUILTIN ||
             !code.has_handler_table() || !code.is_turbofanned()) {

src/wasm/wasm-code-manager.cc

@@ -385,8 +385,6 @@ const char* GetWasmCodeKindAsString(WasmCode::Kind kind) {
       return "wasm-to-capi";
     case WasmCode::kWasmToJsWrapper:
       return "wasm-to-js";
-    case WasmCode::kRuntimeStub:
-      return "runtime-stub";
     case WasmCode::kInterpreterEntry:
       return "interpreter entry";
     case WasmCode::kJumpTable:

src/wasm/wasm-code-manager.h

@@ -78,7 +78,6 @@ class V8_EXPORT_PRIVATE WasmCode final {
     kFunction,
     kWasmToCapiWrapper,
     kWasmToJsWrapper,
-    kRuntimeStub,
     kInterpreterEntry,
     kJumpTable
   };