Move Computed Prop, Array Spread, Object Spread/Rest to Hermes Stable

Summary:
This diff moved object computed properties, es2015 array spread, and es2018
object rest/spread into the hermes stable channel after proper experiments.

Reviewed By: cpojer, avp

Differential Revision: D24900803

fbshipit-source-id: 6be90bdbe30279dcef4613ee7185fab4a45dc3a2

packages/metro-react-native-babel-preset/src/configs/main.js

@@ -131,10 +131,10 @@ const getPreset = (src, options) => {
   // and patch react-refresh to not depend on this transform.
   extraPlugins.push(es2015ArrowFunctions);
 
-  if (!isHermesCanary) {
+  if (!isHermes) {
     extraPlugins.push(es2015ComputedProperty);
   }
-  if (!isHermesCanary && (isNull || hasClass || src.indexOf('...') !== -1)) {
+  if (!isHermes && (isNull || hasClass || src.indexOf('...') !== -1)) {
     extraPlugins.push(es2015Spread);
     extraPlugins.push(objectRestSpread);
   }