PPC64: Define the optional ctz Turbo Fan operator.

src/compiler/ppc/instruction-selector-ppc.cc

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index 73fb41c87ba3dacccbe616dd662c47bb14bbd42c..a671cdc8354b2d7a5b3d46c9f1731b875a45e06b 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -755,6 +755,11 @@ void InstructionSelector::VisitWord32Popcnt(Node* node) {
 void InstructionSelector::VisitWord32Ctz(Node* node) { UNREACHABLE(); }
 
 
+#if V8_TARGET_ARCH_PPC64
+void InstructionSelector::VisitWord64Ctz(Node* node) { UNREACHABLE(); }
+#endif
+
+
 void InstructionSelector::VisitInt32Add(Node* node) {
   VisitBinop<Int32BinopMatcher>(this, node, kPPC_Add, kInt16Imm);
 }