Whitelist node opt --max-old-space-size for JSTransformer

Summary:
Whitelist node opt `--max-old-space-size` for JSTransformer.

Bundling can choke on the default node memory settings for those of us generating large index.js files. This change allows supplied node options to make it through to the node processes spawned by the JSTransformer worker farm.
Closes https://github.com/facebook/metro-bundler/pull/70

Differential Revision: D6008141

Pulled By: cpojer

fbshipit-source-id: 1ef3b436ea30baf3f255a4fd718fe4d958d70c65

packages/metro-bundler/src/JSTransformer/index.js

@@ -61,7 +61,8 @@ function makeFarm(worker, methods, timeout, maxConcurrentWorkers) {
       execArgv: process.execArgv.filter(
         arg =>
           /^--stack[_-]trace[_-]limit=[0-9]+$/.test(arg) ||
-          /^--heap[_-]growing[_-]percent=[0-9]+$/.test(arg),
+          /^--heap[_-]growing[_-]percent=[0-9]+$/.test(arg) ||
+          /^--max[_-]old[_-]space[_-]size=[0-9]+$/.test(arg),
       ),
       maxConcurrentCallsPerWorker: 1,
       maxConcurrentWorkers,