Do not enforce deterministic compilation with read barriers.

Forcing determinism of the boot image compilation (on host)
does not work when read barriers are enabled, as the former
switches the GC to a non-concurrent one by passing the
option `-Xgc:nonconcurrent`.

Also make dex2oat abort when invoked with
`--force-determinism` while read barriers are enabled.

Bug: 12687968
Bug: 26687569
Change-Id: I37b388fccbe4502a90def8031a898f1a40df6a9f