[llvm] [AMDGPU] Add AMDGPU specific tryCandidate() (PR #114957)

[Matt Arsenault via llvm-commits]

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@@ -63,6 +63,10 @@ static cl::opt<bool> GCNTrackers(
     cl::desc("Use the AMDGPU specific RPTrackers during scheduling"),
     cl::init(false));
 
+static cl::opt<bool> UseAMDGPUScheduleHeuristic(
+    "amdgpu-use-amdgpu-schedule-heuristic", cl::Hidden,
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arsenm wrote:

Name and description too general

Also it should be on by default, if an option at all 

https://github.com/llvm/llvm-project/pull/114957