[wasm] Implement I32x4ReplaceLane, I32x4Add, I32x4Sub.

src/compiler/common-operator.h

 // Copyright 2014 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_COMPILER_COMMON_OPERATOR_H_
 #define V8_COMPILER_COMMON_OPERATOR_H_
 
 #include "src/assembler.h"
 #include "src/base/compiler-specific.h"
 #include "src/compiler/frame-states.h"
@@ skipping 242 matching lines @@
   const Operator* Call(const CallDescriptor* descriptor);
   const Operator* TailCall(const CallDescriptor* descriptor);
   const Operator* Projection(size_t index);
   const Operator* Retain();
   const Operator* TypeGuard(Type* type);
 
   // Constructs a new merge or phi operator with the same opcode as {op}, but
   // with {size} inputs.
   const Operator* ResizeMergeOrPhi(const Operator* op, int size);
 
+  // Simd Operators
+  const Operator* Int32x4ExtractLane(int32_t);
+  const Operator* Int32x4ReplaceLane(int32_t);
+  const Operator* Float32x4ExtractLane(int32_t);
+
   // Constructs function info for frame state construction.
   const FrameStateFunctionInfo* CreateFrameStateFunctionInfo(
       FrameStateType type, int parameter_count, int local_count,
       Handle<SharedFunctionInfo> shared_info);
 
  private:
   Zone* zone() const { return zone_; }
 
   const CommonOperatorGlobalCache& cache_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_