[wasm] Extra LEB utilities to leb-helper.h

src/wasm/encoder.h

Index: src/wasm/encoder.h
diff --git a/src/wasm/encoder.h b/src/wasm/encoder.h
index 924f194752df29e711a78f51130e298b775a1c7c..b42ca09df4e77125ffda9f268df13abbda178d42 100644
--- a/src/wasm/encoder.h
+++ b/src/wasm/encoder.h
@@ -50,6 +50,7 @@ class WasmFunctionBuilder : public ZoneObject {
   uint16_t AddParam(LocalType type);
   uint16_t AddLocal(LocalType type);
   void ReturnType(LocalType type);
+  void EmitVarInt(uint32_t val);
   void EmitCode(const byte* code, uint32_t code_size);
   void EmitCode(const byte* code, uint32_t code_size,
                 const uint32_t* local_indices, uint32_t indices_size);
@@ -150,7 +151,6 @@ class WasmModuleBuilder : public ZoneObject {
   int start_function_index_;
 };
 
-std::vector<uint8_t> UnsignedLEB128From(uint32_t result);
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8