PPC: Fix "[turbofan] Add Uint64LessThanOrEqual to 64-bit TurboFan backends."

R=titzer@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1218073008

Cr-Commit-Position: refs/heads/master@{#29501}

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

@@ -1386,6 +1386,12 @@ void InstructionSelector::VisitInt64LessThanOrEqual(Node* node) {
 }
 
 
+void InstructionSelector::VisitUint64LessThan(Node* node) {
+  FlagsContinuation cont(kUnsignedLessThan, node);
+  VisitWord64Compare(this, node, &cont);
+}
+
+
 void InstructionSelector::VisitUint64LessThanOrEqual(Node* node) {
   FlagsContinuation cont(kUnsignedLessThanOrEqual, node);
   VisitWord64Compare(this, node, &cont);