[debug,api] Do not use embedder field for debug context id.

src/wasm/wasm-module.cc

 // Copyright 2015 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 <memory>
 
 #include "src/assembler-inl.h"
 #include "src/base/adapters.h"
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
@@ skipping 117 matching lines @@
     Handle<Code> code = code_table->GetValueChecked<Code>(isolate, i);
     Assembler::FlushICache(isolate, code->instruction_start(),
                            code->instruction_size());
   }
 }
 
 Handle<Script> CreateWasmScript(Isolate* isolate,
                                 const ModuleWireBytes& wire_bytes) {
   Handle<Script> script =
       isolate->factory()->NewScript(isolate->factory()->empty_string());
-  FixedArray* array = isolate->native_context()->embedder_data();
-  script->set_context_data(array->get(v8::Context::kDebugIdIndex));
+  script->set_context_data(isolate->native_context()->debug_context_id());
   script->set_type(Script::TYPE_WASM);
 
   int hash = StringHasher::HashSequentialString(
       reinterpret_cast<const char*>(wire_bytes.start()), wire_bytes.length(),
       kZeroHashSeed);
 
   const int kBufferSize = 32;
   char buffer[kBufferSize];
   int url_chars = SNPrintF(ArrayVector(buffer), "wasm://wasm/%08x", hash);
   DCHECK(url_chars >= 0 && url_chars < kBufferSize);
@@ skipping 3191 matching lines @@
                                      callee_compiled->instruction_start());
     }
     DCHECK_EQ(non_compiled_functions.size(), idx);
   }
 
   Code* ret =
       Code::cast(compiled_module->code_table()->get(func_to_return_idx));
   DCHECK_EQ(Code::WASM_FUNCTION, ret->kind());
   return handle(ret, isolate);
 }