[llvm] [NFC][AMDGPU] Do not flush after printing every instruction (PR #95237)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

> Looks like this breaks tests: http://45.33.8.238/linux/140380/step_11.txt
> 
> Please take a look and revert for now if it takes a while to fix.

Investigating

https://github.com/llvm/llvm-project/pull/95237