dx: workaround a verifier bug

Turn the following code

  move-object vX, vY
  instance-of vY, vX, LMyClass;

into

  move-object vX, vY
  nop
  instance-of vY, vX, LMyClass;

Bug: 120985556
Test: run-all-tests --seq --skip 127-merge-stress
Change-Id: I52939634e855a0580f253d839ac6ecaa7db77078
3 files changed