ART: Fix SimplifyInduction for an instruction with HEnvironment.

After an instruction is removed during RemoveFromCycle its
environment isn't properly cleaned: it still has input instructions
present and registered (those instructions still hold records for
that).

Test: test-art-target, test-art-host.
Change-Id: Iea315bdf735d75fe477f43671f05b40dfecc63a8