[llvm] [CodeGen] Compute call frame sizes instead of storing them in MachineBBs (PR #106964)

[Jay Foad via llvm-commits]

jayfoad wrote:

I'm ambivalent. Recomputing frame sizes instead of storing them seems like a cleaner approach, but it also seems like wasted effort in PEI to do a complete walk of the CFG just to recompute them.

https://github.com/llvm/llvm-project/pull/106964