Testing requirement CDS shared dumping and execution with
-Xshare:auto -showversion

It is possible just to add these flags to Main_Baseline for some days.

From Karen's message:

I do like the idea of adding -Xshare:auto (as well as the -showversion so we find out if the CDS
archive was used please) to any tests that are not explicitly running without compression.

And I do appreciate the detailed suggestions below of
1. vm.gc.quick.testlist all 4 GCs every night w/auto and showversion
2. vm.gc.testlist - every night with the current GCs which rotate (with showversion)
3. vm.parallel_class_loading.testlist and cds.testlist every night in runtime with -Xshare:auto and -showversion