Use correct min/max load factor in intern/class table.

Propagate the min/max load factor that was initially set
based on low memory mode flag to new internal sets.

And clean up some dead code related to image writing.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Change-Id: Id13c8a4833e93458a3f5eed22dc69431311211b7