Don't use free list LOS for --force-determinism.

If the maximum capacity is too large, we can fail mapping the memory
required for it. See:
https://android-build.googleplex.com/builds/pending/P4254206/aosp_arm64-eng/latest)

So instead just disable the LOS.

Also fix concurrent collector assuming there is always a LOS.

Test: build
bug: 37442966
Change-Id: I9d23e02fbfbce014f1da79bddaea8161e735b867