Add __init__ function to all modules created in asm-to-wasm

src/wasm/encoder.h

Index: src/wasm/encoder.h
diff --git a/src/wasm/encoder.h b/src/wasm/encoder.h
index ba72ae1d9b90ce842e7dae995252f53ec831d36d..f0fabe998a0df7d6b8e07a78868c0ef8ab118055 100644
--- a/src/wasm/encoder.h
+++ b/src/wasm/encoder.h
@@ -65,10 +65,11 @@ class WasmFunctionBuilder : public ZoneObject {
   void EditImmediate(uint32_t offset, const byte immediate);
   void Exported(uint8_t flag);
   void External(uint8_t flag);
+  void SetName(const unsigned char* name, int name_length);
   WasmFunctionEncoder* Build(Zone* zone, WasmModuleBuilder* mb) const;
 
  private:
-  WasmFunctionBuilder(Zone* zone, const unsigned char* name, int name_length);
+  explicit WasmFunctionBuilder(Zone* zone);
   friend class WasmModuleBuilder;
   LocalType return_type_;
   struct Type;
@@ -125,8 +126,7 @@ class WasmModuleWriter : public ZoneObject {
 class WasmModuleBuilder : public ZoneObject {
  public:
   explicit WasmModuleBuilder(Zone* zone);
-  uint16_t AddFunction(const unsigned char* name = nullptr,
-                       int name_length = 0);
+  uint16_t AddFunction();
   uint32_t AddGlobal(MachineType type, bool exported);
   WasmFunctionBuilder* FunctionAt(size_t index);
   void AddDataSegment(WasmDataSegmentEncoder* data);