[Wasm] Move data segment data inline to the data segment section

src/wasm/encoder.cc

Index: src/wasm/encoder.cc
diff --git a/src/wasm/encoder.cc b/src/wasm/encoder.cc
index 4ed8e896b6252481db9f731268118deca0bfc995..b3b2a36c7f8108da9b0621f6b72f0727c35bde7a 100644
--- a/src/wasm/encoder.cc
+++ b/src/wasm/encoder.cc
@@ -369,14 +369,11 @@ uint32_t WasmDataSegmentEncoder::BodySize() const {
 
 void WasmDataSegmentEncoder::Serialize(byte* buffer, byte** header,
                                        byte** body) const {
-  uint32_t body_offset = static_cast<uint32_t>(*body - buffer);
-  EmitUint32(header, dest_);
-  EmitUint32(header, body_offset);
-  EmitUint32(header, static_cast<uint32_t>(data_.size()));
-  EmitUint8(header, 1);  // init
-
-  std::memcpy(*body, &data_[0], data_.size());
-  (*body) += data_.size();
+  EmitVarInt(header, dest_);
+  EmitVarInt(header, static_cast<uint32_t>(data_.size()));
+
+  std::memcpy(*header, &data_[0], data_.size());
+  (*header) += data_.size();
 }
 
 WasmModuleBuilder::WasmModuleBuilder(Zone* zone)