Implement xorshift128+ for Math.random.

test/cctest/test-serialize.cc

 // Copyright 2007-2010 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 525 matching lines @@
     {
       v8::HandleScope handle_scope(v8_isolate);
       v8::Local<v8::Context>::New(v8_isolate, env)->Enter();
       // After execution, e's function context refers to the global object.
       CompileRun(
           "var e;"
           "(function() {"
           "  e = function(s) { return eval (s); }"
           "})();"
           "var o = this;"
-          "var r = Math.random() + Math.cos(0);"
+          "var r = Math.sin(0) + Math.cos(0);"
           "var f = (function(a, b) { return a + b; }).bind(1, 2, 3);"
           "var s = parseInt('12345');");
 
       Vector<const uint8_t> source = ConstructSource(
           STATIC_CHAR_VECTOR("function g() { return [,"),
           STATIC_CHAR_VECTOR("1,"),
           STATIC_CHAR_VECTOR("];} a = g(); b = g(); b.push(1);"), 100000);
       v8::MaybeLocal<v8::String> source_str = v8::String::NewFromOneByte(
           v8_isolate, source.start(), v8::NewStringType::kNormal,
           source.length());
@@ skipping 90 matching lines @@
       Handle<JSObject> global_object(context->global_object(), isolate);
       Handle<Object> property = JSReceiver::GetDataProperty(global_object, o);
       CHECK(property.is_identical_to(global_proxy));
 
       v8::Local<v8::Context> v8_context = v8::Utils::ToLocal(context);
       v8::Context::Scope context_scope(v8_context);
       double r = CompileRun("r")
                      ->ToNumber(v8_isolate->GetCurrentContext())
                      .ToLocalChecked()
                      ->Value();
-      CHECK(r >= 1 && r <= 2);
+      CHECK_EQ(1, r);
       int f = CompileRun("f()")
                   ->ToNumber(v8_isolate->GetCurrentContext())
                   .ToLocalChecked()
                   ->Int32Value(v8_isolate->GetCurrentContext())
                   .FromJust();
       CHECK_EQ(5, f);
       f = CompileRun("e('f()')")
               ->ToNumber(v8_isolate->GetCurrentContext())
               .ToLocalChecked()
               ->Int32Value(v8_isolate->GetCurrentContext())
@@ skipping 1113 matching lines @@
   delete script_data;
 }
 
 
 TEST(SerializationMemoryStats) {
   FLAG_profile_deserialization = true;
   FLAG_always_opt = false;
   v8::StartupData blob = v8::V8::CreateSnapshotDataBlob();
   delete[] blob.data;
 }