[llvm] [AMDGPU] Avoid bundling memops in a MBB if the MBB contains a SCHED_BARRIER (PR #153533)

[Yoonseo Choi via llvm-commits]

yoonseoch wrote:

Now the changes are in postra-bundler. Title and descriptions are changed so. 

https://github.com/llvm/llvm-project/pull/153533