[llvm] [AMDGPU] Add insert/extract element test for v4i32 (PR #79384)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > The test looks OK, but what is it testing, and what does it have to do with V_CNDMASK_B32?
> 
> The test was reduced from a QUDA application with which rocm 5.5.1 was generating V_CNDMASK with an illegal operand type. This was found to be from a partial commit in attempt to reland another change. LLVM trunk no longer generates the instruction but I still thought it would be a good test to have.

Do you know what commit fixed it?

https://github.com/llvm/llvm-project/pull/79384