[llvm] Adding change to IndVarSimplify pass to optimize IVs stuck in trivial vector operations (PR #122248)

[via llvm-commits]

anilavakundu007 wrote:

Also, we mostly observed such patterns on IVs from couple of GLSL shaders that prevented loop unrolling hence wanted to focus on IVs particularly! 

https://github.com/llvm/llvm-project/pull/122248