[llvm] [TailRecElim] Introduce support for shift accumulator optimization (PR #181331)

[Antonio Frighetto via llvm-commits]

https://github.com/antoniofrighetto commented:

> ⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️
> 
> You can test this locally with the following command:
> View the diff from clang-format here.

clang-format issues still unaddressed.

https://github.com/llvm/llvm-project/pull/181331