Fix some issues for deoptimizing runtime methods.

Don't dereference a null return value after deoptimizing a runtime
method since we don't classify the return type of a runtime method.
Right now we just re-execute idempotent runtime methods.

Bug: 33616143
Test: host run-test
Change-Id: Ifc81e0e466e46f1b39e632b6af0b5f330bce6413