[inspector] store v8:StackTrace as FixedArray

src/runtime/runtime-wasm.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/assembler.h"
 #include "src/compiler/wasm-compiler.h"
 #include "src/conversions.h"
@@ skipping 81 matching lines @@
         FrameArray::cast(JSArray::cast(*stack_trace_obj)->elements()));
     DCHECK(stack_elements->Code(0)->kind() == AbstractCode::WASM_FUNCTION);
     DCHECK(stack_elements->Offset(0)->value() >= 0);
     stack_elements->SetOffset(0, Smi::FromInt(-1 - byte_offset));
   }
 
   // Patch the detailed stack trace (array of JSObjects with various
   // properties).
   Handle<Object> detailed_stack_trace_obj = JSReceiver::GetDataProperty(
       error, isolate->factory()->detailed_stack_trace_symbol());
-  if (detailed_stack_trace_obj->IsJSArray()) {
+  if (detailed_stack_trace_obj->IsFixedArray()) {
     Handle<FixedArray> stack_elements(
-        FixedArray::cast(JSArray::cast(*detailed_stack_trace_obj)->elements()));
+        FixedArray::cast(*detailed_stack_trace_obj));
     DCHECK_GE(stack_elements->length(), 1);
     Handle<StackFrameInfo> top_frame(
         StackFrameInfo::cast(stack_elements->get(0)));
     if (top_frame->column_number()) {
       top_frame->set_column_number(byte_offset + 1);
     }
   }
 
   return isolate->Throw(*error_obj);
 }
@@ skipping 129 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_WasmCompileLazy) {
   DCHECK(args.length() == 0);
   HandleScope scope(isolate);
 
   return *wasm::CompileLazy(isolate);
 }
 
 }  // namespace internal
 }  // namespace v8