Initialize maths result array in JS.

src/js/prologue.js

Index: src/js/prologue.js
diff --git a/src/js/prologue.js b/src/js/prologue.js
index b91a76562eed0d86e9bd6450e79cfcf77f66791e..e0cf05f1860af31b51c0f77388cbbf24e2d2748f 100644
--- a/src/js/prologue.js
+++ b/src/js/prologue.js
@@ -247,12 +247,12 @@ function PostExperimentals(utils) {
 
   utils.InitializeRNG();
   utils.InitializeRNG = UNDEFINED;
+  utils.CreateDoubleResultArray();
+  utils.CreateDoubleResultArray = UNDEFINED;
 
   utils.Export = UNDEFINED;
   utils.PostDebug = UNDEFINED;
   utils.PostExperimentals = UNDEFINED;
-  utils.InitializeBuiltinTypedArrays = UNDEFINED;
-  utils.SetupTypedArray = UNDEFINED;
   typed_array_setup = UNDEFINED;
 }
 
@@ -264,6 +264,8 @@ function PostDebug(utils) {
 
   utils.InitializeRNG();
   utils.InitializeRNG = UNDEFINED;
+  utils.CreateDoubleResultArray();
+  utils.CreateDoubleResultArray = UNDEFINED;
 
   exports_container = UNDEFINED;
 
@@ -272,8 +274,6 @@ function PostDebug(utils) {
   utils.ImportNow = UNDEFINED;
   utils.PostDebug = UNDEFINED;
   utils.PostExperimentals = UNDEFINED;
-  utils.InitializeBuiltinTypedArrays = UNDEFINED;
-  utils.SetupTypedArray = UNDEFINED;
   typed_array_setup = UNDEFINED;
 }
 
@@ -304,8 +304,6 @@ utils.SetUpLockedPrototype = SetUpLockedPrototype;
 utils.PostNatives = PostNatives;
 utils.PostExperimentals = PostExperimentals;
 utils.PostDebug = PostDebug;
-utils.SetupTypedArray = SetupTypedArray;
-utils.InitializeBuiltinTypedArrays = InitializeBuiltinTypedArrays;
 
 %ToFastProperties(utils);