When running HotSpot jtreg tests in the "AOT mode", for example:

make test JTREG=AOT_JDK=true TEST=open/test/hotspot/jtreg/runtime/stringtable

In the set up phase, we record several AOT configuration files by running a few separate Java programs, and then combine them together with sed, grep, sort and uniq:

https://github.com/openjdk/jdk/blob/adc3f53d2403cd414a91e71c079b4108b2346da0/make/RunTests.gmk#L723-L744

After JDK-8348426, the AOT configuration file will change to a binary format and can no longer be edited this way. In preparation for JDK-8348426, we should change the "JTREG_AOT_JDK=true" set up to run a single Java program that accomplishes the same effect as the current implementation.