AMDGPU/SI: Add SI Machine Scheduler

Summary:
It is off by default, but can be used
with --misched=si

Patch by: Axel Davy

Reviewers: arsenm, tstellarAMD, nhaehnle

Subscribers: nhaehnle, solenskiner, arsenm, llvm-commits

Differential Revision: http://reviews.llvm.org/D11885

llvm-svn: 257609
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
index 22f85b3..b1be619 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -66,8 +66,12 @@
 }
 
 static MachineSchedRegistry
-SchedCustomRegistry("r600", "Run R600's custom scheduler",
-                    createR600MachineScheduler);
+R600SchedRegistry("r600", "Run R600's custom scheduler",
+                   createR600MachineScheduler);
+
+static MachineSchedRegistry
+SISchedRegistry("si", "Run SI's custom scheduler",
+                createSIMachineScheduler);
 
 static std::string computeDataLayout(const Triple &TT) {
   std::string Ret = "e-p:32:32";