Add bytecode conversion experiments

Add a few new instructions and measure savings:
invoke-xx-[1-4]-[move-result].
iget/set-this
new-instance-invoke-this
if-eqz4
if-nez4
etc..

Cumulative Dex bytecode savings are ~14% of the Dex size.

Test: test-art-host
Bug: 77721545

Change-Id: Ibe2b04614e2c5782612b515fbb7f77dbcf9eb66c