AMDGPU: Move subtarget feature checks into passes

llvm-svn: 273937
diff --git a/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp b/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
index 0b9b29a..9e972a5 100644
--- a/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
+++ b/llvm/lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
@@ -412,6 +412,9 @@
     return false;
 
   const SISubtarget &STM = MF.getSubtarget<SISubtarget>();
+  if (!STM.loadStoreOptEnabled())
+    return false;
+
   TII = STM.getInstrInfo();
   TRI = &TII->getRegisterInfo();