Fix CFI tests for heap poisoning.

This is partial revert of "Pack JIT mini-debug-infos together."

The code is correct, but it makes heap poisoning tests fail.

Reverting for now, pending further investigation.

Bug: 122259922
Bug: 122379755
Test: ART_HEAP_POISONING=true ART_USE_READ_BARRIER=true ./art/test.py -b -r -t 137
Change-Id: Ic15e150e0c205439be7753c125e243f77e380cae