[wasm] Refactor handling of data segments in WasmModuleBuilder.

test/cctest/wasm/test-run-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 <stdlib.h>
 #include <string.h>
 
 #include "src/wasm/module-decoder.h"
 #include "src/wasm/wasm-macro-gen.h"
 #include "src/wasm/wasm-module-builder.h"
@@ skipping 92 matching lines @@
   TestSignatures sigs;
 
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   WasmFunctionBuilder* f = builder->AddFunction(sigs.i_v());
 
   ExportAsMain(f);
   byte code[] = {
       WASM_LOAD_MEM(MachineType::Int32(), WASM_I8(kDataSegmentDest0))};
   f->EmitCode(code, sizeof(code));
   byte data[] = {0xaa, 0xbb, 0xcc, 0xdd};
-  builder->AddDataSegment(new (&zone) WasmDataSegmentEncoder(
-      &zone, data, sizeof(data), kDataSegmentDest0));
+  builder->AddDataSegment(data, sizeof(data), kDataSegmentDest0);
   TestModule(&zone, builder, 0xddccbbaa);
 }
 
 TEST(Run_WasmModule_CheckMemoryIsZero) {
   static const int kCheckSize = 16 * 1024;
   v8::internal::AccountingAllocator allocator;
   Zone zone(&allocator);
   TestSignatures sigs;
 
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
@@ skipping 268 matching lines @@
   }
 
   v8::TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate));
   Handle<Object> params[1] = {
       Handle<Object>(Smi::FromInt(25 * kPageSize), isolate)};
   testing::RunWasmModuleForTesting(isolate, instance, 1, params,
                                    ModuleOrigin::kWasmOrigin);
   CHECK(try_catch.HasCaught());
   isolate->clear_pending_exception();
 }