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

[Andrei Safronov via llvm-commits]

andreisfr wrote:

> Unfortunately you should open a separate PR for each of these changes



> Unfortunately you should open a separate PR for each of these changes

Thanks, I removed redundant commits.

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