Use ArrayBuffer instead of SharedArrayBuffer for XRState

Author: Avaer Kazmer

src/XR.js

@@ -546,7 +546,7 @@ GlobalContext.XRInputSourceEvent = XRInputSourceEvent;
 
 class XRRigidTransform {
   constructor(position, orientation, scale) {
-    if (position && position.constructor && position.constructor.name === 'SharedArrayBuffer') {
+    if (typeof position == 'object') {
       const inverse = orientation instanceof XRRigidTransform ? orientation : null;
 
       this.initialize(position, inverse);

src/index.js

@@ -39,7 +39,7 @@ GlobalContext.windows = windows;
 
 const xrState = (() => {
   const _makeSab = size => {
-    const sab = new SharedArrayBuffer(size);
+    const sab = new ArrayBuffer(size);
     let index = 0;
     return (c, n) => {
       const result = new c(sab, index, n);