Manually switch from ART to Dalvik
I just did this!

/data/property/persist.sys.dalvik.vm.lib is a textfile containing one of two values: 'libart.so' or 'libdvm.so'. You can change from ART to Dalvik simply by editing this file.

Ex: adb shell 'echo libdvm.so >/data/property/persist.sys.dalvik.vm.lib'