Generalize the specialized flag-carrying SDNodes by moving flags into SDNode.

This removes BinaryWithFlagsSDNode, and flags are now all passed by value.

Differential Revision: https://reviews.llvm.org/D32527

llvm-svn: 301803
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
index f511085..ccae36c 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
@@ -207,8 +207,8 @@
     return true;
 
   // TODO: Move into isKnownNeverNaN
-  if (const auto *BO = dyn_cast<BinaryWithFlagsSDNode>(N))
-    return BO->Flags.hasNoNaNs();
+  if (N->getFlags().isDefined())
+    return N->getFlags().hasNoNaNs();
 
   return CurDAG->isKnownNeverNaN(N);
 }