R600: Move computeMaskedBitsForTargetNode out of AMDILISelLowering.cpp

Remove handling of select_cc, since it makes no sense to be there. This
now does nothing, but I'll be adding some handling of other target nodes
soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204743 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/AMDGPUISelLowering.cpp

@@ -1156,3 +1156,12 @@ const char* AMDGPUTargetLowering::getTargetNodeName(unsigned Opcode) const {
   NODE_NAME_CASE(TBUFFER_STORE_FORMAT)
   }
 }
+
+void AMDGPUTargetLowering::computeMaskedBitsForTargetNode(
+  const SDValue Op,
+  APInt &KnownZero,
+  APInt &KnownOne,
+  const SelectionDAG &DAG,
+  unsigned Depth) const {
+  KnownZero = KnownOne = APInt(KnownOne.getBitWidth(), 0); // Don't know anything.
+}