Initialize maths result array in JS.

src/third_party/fdlibm/fdlibm.js

Index: src/third_party/fdlibm/fdlibm.js
diff --git a/src/third_party/fdlibm/fdlibm.js b/src/third_party/fdlibm/fdlibm.js
index 6a64c6ca52697118fdb2fa0b6121802d03173d0e..a5e789f38a59d56083c82338aca4cd59bbb7aee0 100644
--- a/src/third_party/fdlibm/fdlibm.js
+++ b/src/third_party/fdlibm/fdlibm.js
@@ -28,6 +28,7 @@
 // -------------------------------------------------------------------
 // Imports
 
+var GlobalFloat64Array = global.Float64Array;
 var GlobalMath = global.Math;
 var MathAbs;
 var MathExp;
@@ -39,9 +40,9 @@ utils.Import(function(from) {
   MathExp = from.MathExp;
 });
 
-utils.SetupTypedArray(function(arg) {
-  rempio2result = arg;
-});
+utils.CreateDoubleResultArray = function(global) {
+  rempio2result = new GlobalFloat64Array(2);
+};
 
 // -------------------------------------------------------------------