[llvm] [AMDGPU] Partially revert my llvm::less_second patch (PR #136615)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/136615

This patch partially reverts:

  commit 5e1b0f97735083b6762834b83fdbb35e76002e03
  Author: Kazu Hirata <kazu at google.com>
  Date:   Fri Apr 18 10:05:55 2025 -0700

to fix:

  LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
  LLVM :: CodeGen/AMDGPU/sched-group-barrier-pre-RA.mir

under LLVM_ENABLE_EXPENSIVE_CHECKS.


>From f6d317bc0f0487e13216c5ba7d52a3d8b063535d Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Mon, 21 Apr 2025 14:01:04 -0700
Subject: [PATCH] [AMDGPU] Partially revert my llvm::less_second patch

This patch partially reverts:

  commit 5e1b0f97735083b6762834b83fdbb35e76002e03
  Author: Kazu Hirata <kazu at google.com>
  Date:   Fri Apr 18 10:05:55 2025 -0700

to fix:

  LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
  LLVM :: CodeGen/AMDGPU/sched-group-barrier-pre-RA.mir

under LLVM_ENABLE_EXPENSIVE_CHECKS.
---
 llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp b/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp
index 815715604bc96..87c1d2586cce5 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUIGroupLP.cpp
@@ -589,7 +589,7 @@ void PipelineSolver::populateReadyList(
   }
 
   if (UseCostHeur)
-    llvm::sort(ReadyList, llvm::less_second());
+    std::sort(ReadyList.begin(), ReadyList.end(), llvm::less_second());
 
   assert(ReadyList.size() == CurrSU.second.size());
 }