lib: check SharedArrayBuffer availability in freeze_intrinsics.js

PR-URL: nodejs#49482
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

lib/internal/freeze_intrinsics.js

@@ -203,7 +203,6 @@ module.exports = function() {
 
     // 25 Structured Data
     ArrayBufferPrototype, // 25.1
-    SharedArrayBuffer.prototype, // 25.2
     DataViewPrototype, // 25.3
 
     // 26 Managing Memory
@@ -309,7 +308,6 @@ module.exports = function() {
 
     // 25 Structured Data
     ArrayBuffer, // 25.1
-    SharedArrayBuffer, // 25.2
     DataView, // 25.3
     Atomics, // 25.4
     // eslint-disable-next-line node-core/prefer-primordials
@@ -354,6 +352,11 @@ module.exports = function() {
     WebAssembly,
   ];
 
+  if (typeof SharedArrayBuffer !== 'undefined') { // 25.2
+    ArrayPrototypePush(intrinsicPrototypes, SharedArrayBuffer.prototype);
+    ArrayPrototypePush(intrinsics, SharedArrayBuffer);
+  }
+
   if (typeof Intl !== 'undefined') {
     ArrayPrototypePush(intrinsicPrototypes,
                        Intl.Collator.prototype,