[llvm] [PowerPC] Exploit xxeval instruction for ternary patterns - part 1 (PR #141733)

[Tony Varghese via llvm-commits]

tonykuttai wrote:

@amy-kwan 
Based on the discussion updated the PR to support only v4i32 types only. 

Support for other types (V2i64, V16i8, v8i16) will done as an future patch.

https://github.com/llvm/llvm-project/pull/141733