[llvm] [llvm] Move data layout string computation to TargetParser (PR #157612)

[Nikita Popov via llvm-commits]

nikic wrote:

@rolfmorel The information about cpus and target features for a triple is also part of TargetParser -- but the interface to access that information is pretty terrible right now (basically each target has its own bespoke APIs, there is no common way to query this across targets).

https://github.com/llvm/llvm-project/pull/157612