Revert of Implement xorshift128+ for Math.random.

src/js/prologue.js

Index: src/js/prologue.js
diff --git a/src/js/prologue.js b/src/js/prologue.js
index efcd6bbad541964c353c2ca6b2c2f9809ce82771..0f605be6490839ccaa7e35ddad327e435318e69f 100644
--- a/src/js/prologue.js
+++ b/src/js/prologue.js
@@ -245,6 +245,8 @@
     imports_from_experimental(exports_container);
   }
 
+  utils.InitializeRNG();
+  utils.InitializeRNG = UNDEFINED;
   utils.CreateDoubleResultArray();
   utils.CreateDoubleResultArray = UNDEFINED;
 
@@ -260,6 +262,8 @@
     imports(exports_container);
   }
 
+  utils.InitializeRNG();
+  utils.InitializeRNG = UNDEFINED;
   utils.CreateDoubleResultArray();
   utils.CreateDoubleResultArray = UNDEFINED;
 
@@ -285,7 +289,7 @@
 
 // -----------------------------------------------------------------------
 
-%OptimizeObjectForAddingMultipleProperties(utils, 14);
+%OptimizeObjectForAddingMultipleProperties(utils, 15);
 
 utils.Import = Import;
 utils.ImportNow = ImportNow;