Add kJitTableAddress for HLoadClass.

This new kind loads classes from the root table associated with
JIT compiled code.

Also remove kDexCacheAddress, which is replaced by kJitTableAddress.

test: ART_TEST_JIT=true test-art-host-jit test-art-target-jit
Change-Id: Ia23029688d1a60c178bf2ffa7463927c5d5de4d0