ART: Add verifier-debug log for exception handler

Helps tracking register state, in the case it is not a merge
but the initial setting of the target register line.

(cherry picked from commit bfcca58145d796fd05a68645b03229b0f3ce185e)

Bug: 130907607
Test: m test-art-host
Merged-In: Idebc230cd5a187b2ba986a25c536a8c2ca552d82
Change-Id: Idebc230cd5a187b2ba986a25c536a8c2ca552d82