[wasm] Introduce EmitVarInt and EmitWithVarInt

src/wasm/wasm-module-builder.h

 // 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.
 
 #ifndef V8_WASM_WASM_MODULE_BUILDER_H_
 #define V8_WASM_WASM_MODULE_BUILDER_H_
 
 #include "src/signature.h"
 #include "src/zone/zone-containers.h"
 
@@ skipping 103 matching lines @@
   byte* end_;
 };
 
 class WasmModuleBuilder;
 
 class V8_EXPORT_PRIVATE WasmFunctionBuilder : public ZoneObject {
  public:
   // Building methods.
   void SetSignature(FunctionSig* sig);
   uint32_t AddLocal(ValueType type);
+  void EmitVarInt(int32_t val);
   void EmitVarUint(uint32_t val);
   void EmitCode(const byte* code, uint32_t code_size);
   void Emit(WasmOpcode opcode);
   void EmitGetLocal(uint32_t index);
   void EmitSetLocal(uint32_t index);
   void EmitTeeLocal(uint32_t index);
   void EmitI32Const(int32_t val);
   void EmitWithU8(WasmOpcode opcode, const byte immediate);
   void EmitWithU8U8(WasmOpcode opcode, const byte imm1, const byte imm2);
+  void EmitWithVarInt(WasmOpcode opcode, int32_t immediate);
   void EmitWithVarUint(WasmOpcode opcode, uint32_t immediate);
   void EmitDirectCallIndex(uint32_t index);
   void ExportAs(Vector<const char> name);
   void SetName(Vector<const char> name);
   void AddAsmWasmOffset(int call_position, int to_number_position);
   void SetAsmFunctionStartPosition(int position);
 
   void WriteSignature(ZoneBuffer& buffer) const;
   void WriteExports(ZoneBuffer& buffer) const;
   void WriteBody(ZoneBuffer& buffer) const;
@@ skipping 138 matching lines @@
 
 inline FunctionSig* WasmFunctionBuilder::signature() {
   return builder_->signatures_[signature_index_];
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_WASM_MODULE_BUILDER_H_