Are there any journals or conferences that take into account the availability of the source code when selecting the papers to publish?
I can confirm the answer given by amlrg in comments. I have recently published a paper in Computer Physics Communications and the referees pay significant attention to the code. There was no requirement, however, to upload the code as Supplementary Material with the paper &mdash; the referees were happy to consider our public github repository. It was probably the first time in my practice when referees have actually bother themselves to reproduce the results claimed. We had a number of comments regarding the clarity of the run files in the code (but not in the rest of it), and even a suggestion on design.