[llvm] [AMDGPU][Verifier] Mark calls to entry functions as invalid in the IR verifier (PR #134910)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> This patch breaks tests for non AMDGPU code, see https://github.com/KhronosGroup/SPIRV-LLVM-Translator/actions/runs/14434681816/job/40473808013
> 
> From OpenCL POW it's legal for a kernel to call another kernel.

Which is entirely a clang problem and now correctly implemented in 642481a4286c9006958274531ee173b347866c50

https://github.com/llvm/llvm-project/pull/134910