[optimizing] Use baseline when debuggable is set.

SSA form conflicts with JDWP's SetValue functionality. Because
we do not deopt all the call stack, we may call SetValue on a
compiled frame, which doesn't work with optimizing. Simplest
solution for now is to just use baseline.

Change-Id: I91738b363eec8fef145486bd96681aea73a1baa8
3 files changed