To prevent issues where the autotuner is run too late etc (c.f. #1265), we should devide the modification of the config into two phase: Config building and analysis:

• Functions during building (get_build, set_build: The implementer needs to ensure correct order)
• freeze
• Functions during analysis (get_analysis)

If a call happens in the wrong phase, the analyzer should crash, making it easier to hunt-down such issues instead of having to deal with cases where settings seemingly are not applied.