Revert of Remove SIMD.js from V8.

test/cctest/ast-types-fuzz.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 98 matching lines @@
     AnyArray = AstType::Array(Any, zone);
 
     SignedFunction1 = AstType::Function(SignedSmall, SignedSmall, zone);
     NumberFunction1 = AstType::Function(Number, Number, zone);
     NumberFunction2 = AstType::Function(Number, Number, Number, zone);
     MethodFunction = AstType::Function(String, Object, 0, zone);
 
     for (int i = 0; i < 30; ++i) {
       types.push_back(Fuzz());
     }
-    USE(isolate_);  // Currently unused.
   }
 
   Handle<i::Map> object_map;
   Handle<i::Map> array_map;
   Handle<i::Map> number_map;
   Handle<i::Map> uninitialized_map;
 
   Handle<i::Smi> smi;
   Handle<i::HeapNumber> signed32;
   Handle<i::JSObject> object1;
@@ skipping 151 matching lines @@
         AstType* result = Fuzz(depth / 2);
         AstType* receiver = Fuzz(depth / 2);
         int arity = rng_->NextInt(3);
         AstType* type = AstType::Function(result, receiver, arity, zone_);
         for (int i = 0; i < type->AsFunction()->Arity(); ++i) {
           AstType* parameter = Fuzz(depth / 2);
           type->AsFunction()->InitParameter(i, parameter);
         }
         return type;
       }
+      case 8: {  // simd
+        static const int num_simd_types =
+#define COUNT_SIMD_TYPE(NAME, Name, name, lane_count, lane_type) +1
+            SIMD128_TYPES(COUNT_SIMD_TYPE);
+#undef COUNT_SIMD_TYPE
+        AstType* (*simd_constructors[num_simd_types])(Isolate*, Zone*) = {
+#define COUNT_SIMD_TYPE(NAME, Name, name, lane_count, lane_type) &AstType::Name,
+            SIMD128_TYPES(COUNT_SIMD_TYPE)
+#undef COUNT_SIMD_TYPE
+        };
+        return simd_constructors[rng_->NextInt(num_simd_types)](isolate_,
+                                                                zone_);
+      }
       default: {  // union
         int n = rng_->NextInt(10);
         AstType* type = None;
         for (int i = 0; i < n; ++i) {
           AstType* operand = Fuzz(depth - 1);
           type = AstType::Union(type, operand, zone_);
         }
         return type;
       }
     }
     UNREACHABLE();
   }
 
   Zone* zone() { return zone_; }
 
  private:
   Zone* zone_;
   Isolate* isolate_;
   v8::base::RandomNumberGenerator* rng_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif