[wasm] Gate SIMD load/store opcodes with the --wasm-simd-prototype flag.

src/wasm/function-body-decoder.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/base/platform/elapsed-timer.h"
 #include "src/bit-vector.h"
 #include "src/flags.h"
 #include "src/handles.h"
@@ skipping 1140 matching lines @@
           case kExprI64LoadMem:
             len = DecodeLoadMem(kWasmI64, MachineType::Int64());
             break;
           case kExprF32LoadMem:
             len = DecodeLoadMem(kWasmF32, MachineType::Float32());
             break;
           case kExprF64LoadMem:
             len = DecodeLoadMem(kWasmF64, MachineType::Float64());
             break;
           case kExprS128LoadMem:
+            CHECK_PROTOTYPE_OPCODE(wasm_simd_prototype);
             len = DecodeLoadMem(kWasmS128, MachineType::Simd128());
             break;
           case kExprI32StoreMem8:
             len = DecodeStoreMem(kWasmI32, MachineType::Int8());
             break;
           case kExprI32StoreMem16:
             len = DecodeStoreMem(kWasmI32, MachineType::Int16());
             break;
           case kExprI32StoreMem:
             len = DecodeStoreMem(kWasmI32, MachineType::Int32());
@@ skipping 10 matching lines @@
           case kExprI64StoreMem:
             len = DecodeStoreMem(kWasmI64, MachineType::Int64());
             break;
           case kExprF32StoreMem:
             len = DecodeStoreMem(kWasmF32, MachineType::Float32());
             break;
           case kExprF64StoreMem:
             len = DecodeStoreMem(kWasmF64, MachineType::Float64());
             break;
           case kExprS128StoreMem:
+            CHECK_PROTOTYPE_OPCODE(wasm_simd_prototype);
             len = DecodeStoreMem(kWasmS128, MachineType::Simd128());
             break;
           case kExprGrowMemory: {
             if (!CheckHasMemory()) break;
             MemoryIndexOperand operand(this, pc_);
             DCHECK_NOT_NULL(module_);
             if (module_->is_wasm()) {
               Value val = Pop(0, kWasmI32);
               Push(kWasmI32, BUILD(GrowMemory, val.node));
             } else {
@@ skipping 966 matching lines @@
 BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals,
                                            const byte* start, const byte* end) {
   Decoder decoder(start, end);
   return WasmDecoder::AnalyzeLoopAssignment(&decoder, start,
                                             static_cast<int>(num_locals), zone);
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8