[llvm] [SROA] Allow rewriting memcpy depending on tbaa.struct (PR #77597)

[Björn Pettersson via llvm-commits]

bjope wrote:

I'll have a look into adjusting getCommonType instead. I might have overcomplicated things when I thought about the impact of memcpy:s being "users" of the alloca slice.
I'll at least make another attempt to see if we can solve the problem that way instead. (Not sure how to mark this as "planned changes" while investigating that option further.)

https://github.com/llvm/llvm-project/pull/77597