[wasm] Simd128 types should not be available in asmjs modules.

src/wasm/ast-decoder.h

 // 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.
 
 #ifndef V8_WASM_AST_DECODER_H_
 #define V8_WASM_AST_DECODER_H_
 
 #include "src/signature.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-opcodes.h"
@@ skipping 138 matching lines @@
         return true;
       case kLocalI64:
         *result = kAstI64;
         return true;
       case kLocalF32:
         *result = kAstF32;
         return true;
       case kLocalF64:
         *result = kAstF64;
         return true;
+      case kLocalS128:
+        *result = kAstS128;
+        return true;
       default:
         *result = kAstStmt;
         return false;
     }
   }
   LocalType read_entry(unsigned index) {
     DCHECK_LT(index, arity);
     LocalType result;
     CHECK(decode_local_type(types[index], &result));
     return result;
@@ skipping 241 matching lines @@
   }
 
   bool has_next() { return pc_ < end_; }
 };
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_AST_DECODER_H_