Add a get_last_error_message JVMTI extension.

This adds a com.android.art.misc.get_last_error_message and
com.android.art.misc.clear_last_error_message extension functions.
These allow one to get some error messages that were previously only
exposed through logcat. Not all error messages are exposed. Only
exposes error messages associated with the exact jvmtiEnv used. Errors
must be cleared manually. Not all error conditions will update the
saved error-message.

Bug: 117234143
Test: ./test.py --host
Change-Id: I75b6de9029791035f56c0c63d8958edea500715d