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

src/wasm/asm-wasm-builder.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/v8.h"
 
 // Required to get M_E etc. in MSVC.
 #if defined(_WIN32)
 #define _USE_MATH_DEFINES
 #endif
@@ skipping 781 matching lines @@
       size = 4;
     } else if (type->Is(cache_.kFloat32Array)) {
       mtype = MachineType::Float32();
       size = 4;
     } else if (type->Is(cache_.kFloat64Array)) {
       mtype = MachineType::Float64();
       size = 8;
     } else {
       UNREACHABLE();
     }
-    current_function_builder_->EmitWithU8(
-        WasmOpcodes::LoadStoreOpcodeOf(mtype, is_set_op_),
-        WasmOpcodes::LoadStoreAccessOf(false));
+    // TODO(titzer): use special asm-compatibility opcodes?
+    current_function_builder_->EmitWithU8U8(
+        WasmOpcodes::LoadStoreOpcodeOf(mtype, is_set_op_), 0, 0);
     is_set_op_ = false;
     if (size == 1) {
       // Allow more general expression in byte arrays than the spec
       // strictly permits.
       // Early versions of Emscripten emit HEAP8[HEAP32[..]|0] in
       // places that strictly should be HEAP8[HEAP32[..]>>0].
       RECURSE(Visit(expr->key()));
       return;
     } else {
       Literal* value = expr->key()->AsLiteral();
@@ skipping 703 matching lines @@
 // that zone in constructor may be thrown away once wasm module is written.
 WasmModuleIndex* AsmWasmBuilder::Run() {
   AsmWasmBuilderImpl impl(isolate_, zone_, literal_, foreign_, typer_);
   impl.Compile();
   WasmModuleWriter* writer = impl.builder_->Build(zone_);
   return writer->WriteTo(zone_);
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8