[AMDGPU] Change std::sort to llvm::sort in response to r327219

[AMDGPU] Change std::sort to llvm::sort in response to r327219

Summary:
r327219 added wrappers to std::sort which randomly shuffle the container before sorting.
This will help in uncovering non-determinism caused due to undefined sorting
order of objects having the same key.

To make use of that infrastructure we need to invoke llvm::sort instead of std::sort.

Reviewers: tstellar, RKSimon, arsenm

Reviewed By: arsenm

Subscribers: arsenm, kzhuravl, wdng, nhaehnle, yaxunl, dstuttard, tpr, llvm-commits, t-tye

Differential Revision: https://reviews.llvm.org/D44856

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328429 91177308-0d34-0410-b5e6-96231b3b80d8