[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

src/compiler/mips64/instruction-selector-mips64.cc

Index: src/compiler/mips64/instruction-selector-mips64.cc
diff --git a/src/compiler/mips64/instruction-selector-mips64.cc b/src/compiler/mips64/instruction-selector-mips64.cc
index b689c0a7c8d9ffd726ea795ce7eaad7fc4bf4fa5..cea4bd676ad5aa4c64282550b9b87193eb7947c9 100644
--- a/src/compiler/mips64/instruction-selector-mips64.cc
+++ b/src/compiler/mips64/instruction-selector-mips64.cc
@@ -712,6 +712,11 @@ void InstructionSelector::VisitChangeFloat64ToInt64(Node* node) {
 }
 
 
+void InstructionSelector::VisitTruncateFloat64ToUint64(Node* node) {
+  UNIMPLEMENTED();
+}
+
+
 void InstructionSelector::VisitChangeInt32ToInt64(Node* node) {
   Mips64OperandGenerator g(this);
   Emit(kMips64Shl, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)),