This is useful as a debug option and will be useful to have in upstream
while comparing output between current vixl emitter and the new emitter.
With this in place I can easily do binary comparisons to see where I
have mistakes in the new emitter.
We don't want this enabled in release builds as it is a debug feature.
This has already caught a bunch of mistakes, so make it easier by
upstreaming.
It'll likely be useful in the future as well when we are inspecting code
running in the vixl simulator.
Ryan Houdek
0d7c086b69