Still seeing long link times for NBA2K20 trace. Breaking
up SetupContext into even smaller chunks helps.

Test: Compile and link NBA2K20 trace for Android
Bug: b/160014453
Bug: angleproject:4048
Change-Id: Ic8f6d7e8d1c35cbee986da670c0beeb4b77c4e7c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2339853
Commit-Queue: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Manh Nguyen <nguyenmh@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>