[llvm] [Xtensa] Initial codegen support from IR (PR #78548)

[Alexey Gerenkov via llvm-commits]

gerekon wrote:

@MaskRay sorry for bothering you. I am from Espressif LLVM team.

> I think the patch series https://reviews.llvm.org/D145658 may be too fine-grained. It might be better to pack more changes in one PR, otherwise there could be a lot of `-Wunused-private-field` and not many testable units.

Looks like this conflicts with suggestions from @s-barannikov https://github.com/llvm/llvm-project/pull/78548#pullrequestreview-1837076213. As far as I understood he proposed to split it into more fine-grained commits.
Or I miss smth?

https://github.com/llvm/llvm-project/pull/78548