swift234

Merge 2 steps in data flow in DSE into 1. The more we iterate over the instructions in the function,
the more compilation time DSE take.

I see a ~10% drop in DSE compilation time, from 2.4% to 2.2%.

(Last time (~1 week ago) i checked DSE was taking 1.4% of the compilation time.  Now its taking 2.2%.
I will look into where the increase come from later).