[WASM] Simplify SIMD shuffle opcodes.

test/unittests/wasm/function-body-decoder-unittest.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 "test/unittests/test-utils.h"
 
 #include "src/objects-inl.h"
 #include "src/objects.h"
 #include "src/v8.h"
 #include "src/wasm/function-body-decoder-impl.h"
@@ skipping 2607 matching lines @@
 
 TEST_F(WasmOpcodeLengthTest, SimdExpressions) {
 #define TEST_SIMD(name, opcode, sig) \
   EXPECT_LENGTH_N(2, kSimdPrefix, static_cast<byte>(kExpr##name & 0xff));
   FOREACH_SIMD_0_OPERAND_OPCODE(TEST_SIMD)
 #undef TEST_SIMD
 #define TEST_SIMD(name, opcode, sig) \
   EXPECT_LENGTH_N(3, kSimdPrefix, static_cast<byte>(kExpr##name & 0xff));
   FOREACH_SIMD_1_OPERAND_OPCODE(TEST_SIMD)
 #undef TEST_SIMD
-  EXPECT_LENGTH_N(6, kSimdPrefix, static_cast<byte>(kExprS32x4Shuffle & 0xff));
-  EXPECT_LENGTH_N(10, kSimdPrefix, static_cast<byte>(kExprS16x8Shuffle & 0xff));
   EXPECT_LENGTH_N(18, kSimdPrefix, static_cast<byte>(kExprS8x16Shuffle & 0xff));
 #undef TEST_SIMD
   // test for bad simd opcode
   EXPECT_LENGTH_N(2, kSimdPrefix, 0xff);
 }
 
 typedef ZoneVector<ValueType> TypesOfLocals;
 
 class LocalDeclDecoderTest : public TestWithZone {
  public:
@@ skipping 169 matching lines @@
   EXPECT_EQ(3u, decls.encoded_size);
   EXPECT_EQ(3u, iter.pc_offset());
   EXPECT_TRUE(iter.has_next());
   EXPECT_EQ(kExprI32Const, iter.current());
   iter.next();
   EXPECT_TRUE(iter.has_next());
   EXPECT_EQ(kExprI32Const, iter.current());
   iter.next();
   EXPECT_FALSE(iter.has_next());
 }