[llvm] [AMDGPU] A SCHED_BARRIER in a bundle should not prevent other SCHED_BARRIERs to be considered (PR #152627)

[Yoonseo Choi via llvm-commits]

yoonseoch wrote:

Will follow up on an alternative approach of not bundling meta instructions with memory operation. 

https://github.com/llvm/llvm-project/pull/152627