Revert "Temporarily disable lazy class-file-load-hook"

An ASAN failure was caused by a rare interaction between the
fault-handler and updating the internal book-keeping for the
ClassFileLoadHook. When we update the current definition for the
ClassFileLoadHook we check to see if the definition has actually
changed. This causes a read from the previous dex-file buffer. If the
buffer is lazy and the agent never accessed it (very rare outside of
testing) the SEGV will occur within art code in the kRunnable state.
This caused the runtime to think the SEGV was coming from java code
and perform some illegal reads prior to figuring out that the SEGV did
not come from java.

To fix this we simply make sure all the code that can cause the SEGV
occurs while the runtime is in kNative state.

We add an assert for this in the fault handler itself.

Reason for revert: Fixed issue causing ASAN failure with lazy dex-file
                   load hook.

This reverts commit 37977705.


Bug: 72909916
Test: ./test/testrunner/run-_build_test_target.py -j50 art-asan

Change-Id: I8b2d2fda8092a379e0019db15ec360a5a63d8b3f