Increased memory usage on 3.5.1

[bowles123]

Running on node v12.13 we are running into an issue when building for e2e in CI. ```ERROR Summary:

• broccoliBuilderErrorStack: Error [ERR_WORKER_OUT_OF_MEMORY] [ERR_WORKER_OUT_OF_MEMORY]: Worker terminated due to reaching memory limit: JS heap out of memory
  at Worker.[kOnExit] (internal/worker.js:238:26)
  at Worker..onexit (internal/worker.js:168:20)
• code: [undefined]
• codeFrame: Worker terminated due to reaching memory limit: JS heap out of memory
• errorMessage: securitytrax-ember-ui/my-inventory/spillage/route.js: Worker terminated due to reaching memory limit: JS heap out of memory
  in /tmp/broccoli-17RkwpLngz5vg5/out-1024-analyzer_ember_auto_import_analyzer
  at broccoli-persistent-filter:Babel > [Babel: securitytrax-ember-ui] (Babel: securitytrax-ember-ui)
• errorType: Build Error
• location:
  • column: [undefined]
  • file: securitytrax-ember-ui/my-inventory/spillage/route.js
  • line: [undefined]
  • treeDir: /tmp/broccoli-17RkwpLngz5vg5/out-1024-analyzer_ember_auto_import_analyzer
• message: securitytrax-ember-ui/my-inventory/spillage/route.js: Worker terminated due to reaching memory limit: JS heap out of memory
  in /tmp/broccoli-17RkwpLngz5vg5/out-1024-analyzer_ember_auto_import_analyzer
  at broccoli-persistent-filter:Babel > [Babel: securitytrax-ember-ui] (Babel: securitytrax-ember-ui)
• name: Error
• nodeAnnotation: Babel: securitytrax-ember-ui
• nodeName: broccoli-persistent-filter:Babel > [Babel: securitytrax-ember-ui]
• originalErrorMessage: Worker terminated due to reaching memory limit: JS heap out of memory
• stack: Error [ERR_WORKER_OUT_OF_MEMORY] [ERR_WORKER_OUT_OF_MEMORY]: Worker terminated due to reaching memory limit: JS heap out of memory
  at Worker.[kOnExit] (internal/worker.js:238:26)
  at Worker..onexit (internal/worker.js:168:20)```