Cleanup enabling / disabling deoptimization support

Enabling deoptimization support is a nop and doesn't need to do
anything. Deoptimize / DeoptimizeEverything install any
instrumentation stubs required.

Disabling deoptimization should uninstall any stubs installed
for deoptimization. We special cased only for interpreter stubs
earlier.

Bug: 206029744
Test: test.py --gtest --run-test
Change-Id: I714ac3f9e05509b1db1a9ef11a8d66420a5394fb