Install instrumentation stubs for supporting single thread deopts

We used to instrument with interpreter for supporting single
thread deoptimization. This is not necessary so just
install instrumentation stubs.

Also updates EnsureJitCompiled to handle cases when entry exit
stubs are installed.

Bug: 206029744
Test: test.py
Change-Id: I1d49c7992c7ead7c9f77bf7a432065d440bd5801
2 files changed