[WASM] Eliminate SIMD boolean vector types.

src/wasm/function-body-decoder-impl.h

 // Copyright 2017 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_WASM_FUNCTION_BODY_DECODER_IMPL_H_
 #define V8_WASM_FUNCTION_BODY_DECODER_IMPL_H_
 
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-opcodes.h"
 
@@ skipping 134 matching lines @@
         return true;
       case kLocalF32:
         *result = kWasmF32;
         return true;
       case kLocalF64:
         *result = kWasmF64;
         return true;
       case kLocalS128:
         *result = kWasmS128;
         return true;
-      case kLocalS1x4:
-        *result = kWasmS1x4;
-        return true;
-      case kLocalS1x8:
-        *result = kWasmS1x8;
-        return true;
-      case kLocalS1x16:
-        *result = kWasmS1x16;
-        return true;
       default:
         *result = kWasmStmt;
         return false;
     }
   }
   ValueType read_entry(unsigned index) {
     DCHECK_LT(index, arity);
     ValueType result;
     CHECK(decode_local_type(types[index], &result));
     return result;
@@ skipping 162 matching lines @@
   }
 };
 
 #undef CHECKED_COND
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_FUNCTION_BODY_DECODER_IMPL_H_