Merge "Improve launcher loading times." into sc-v2-dev am: e48d931740 am: 12e1e166fa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/systemui/+/15616234

Change-Id: I37ba4459c2354d5692fa25872c92b28b0ee80619
tree: d35624b3b61a3d64f7b49492b46756accb307b0b
  1. iconloaderlib/
  2. searchuilib/