Original fix was backed out due to massive failures, see JDK-8371958 and also JDK-8360557. We run hotspot_compiler with additional stress flags in the higher tiers and therefore hit all these bugs with CTW now. Let's REDO once the bugs are fixed.

CTW tests are for compiler testing, so it makes sense to run them as part of hotspot_compiler group. There are no external dependencies for CTW that processes JDK-s own modules, so we can add that.