[llvm] [VectorCombine] Add Ext and Trunc support in foldBitOpOfCastConstant (PR #157822)

[Rajveer Singh Bharadwaj via llvm-commits]

Rajveer100 wrote:

> @Rajveer100. Do you mean replacing terms like `<i32 1, i32 2, i32 3, i32 4>` with `splat (i32 1)` in the original testcases?

Not quite, this would change the test case itself, I meant replacing the ones where they all are equal not affecting the actual values.

https://github.com/llvm/llvm-project/pull/157822