[wasm] Encode immediates to Load and Store as varint.

src/wasm/encoder.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 "src/signature.h"
 
 #include "src/handles.h"
 #include "src/v8.h"
 #include "src/zone-containers.h"
 
@@ skipping 113 matching lines @@
 void WasmFunctionBuilder::Emit(WasmOpcode opcode) {
   body_.push_back(static_cast<byte>(opcode));
 }
 
 
 void WasmFunctionBuilder::EmitWithU8(WasmOpcode opcode, const byte immediate) {
   body_.push_back(static_cast<byte>(opcode));
   body_.push_back(immediate);
 }
 
+void WasmFunctionBuilder::EmitWithU8U8(WasmOpcode opcode, const byte imm1,
+                                       const byte imm2) {
+  body_.push_back(static_cast<byte>(opcode));
+  body_.push_back(imm1);
+  body_.push_back(imm2);
+}
+
 void WasmFunctionBuilder::EmitWithVarInt(WasmOpcode opcode,
                                          uint32_t immediate) {
   body_.push_back(static_cast<byte>(opcode));
   size_t immediate_size = SizeOfVarInt(immediate);
   body_.insert(body_.end(), immediate_size, 0);
   byte* p = &body_[body_.size() - immediate_size];
   EmitVarInt(&p, immediate);
 }
 
 uint32_t WasmFunctionBuilder::EmitEditableVarIntImmediate() {
@@ skipping 496 matching lines @@
       next = next | 0x80;
     }
     output.push_back(next);
     shift += 7;
   } while ((next & 0x80) != 0);
   return output;
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8