[turbofan] Added the optional Float64RoundUp operator to turbofan.

src/compiler/x87/instruction-selector-x87.cc

Index: src/compiler/x87/instruction-selector-x87.cc
diff --git a/src/compiler/x87/instruction-selector-x87.cc b/src/compiler/x87/instruction-selector-x87.cc
index 5c6f10255f6a8f20910fbbe9c32f46ede9f44d29..3a0335b55b4fd8fe5edce4e8d13afa8870910261 100644
--- a/src/compiler/x87/instruction-selector-x87.cc
+++ b/src/compiler/x87/instruction-selector-x87.cc
@@ -849,6 +849,9 @@ void InstructionSelector::VisitFloat64RoundDown(Node* node) {
 }
 
 
+void InstructionSelector::VisitFloat64RoundUp(Node* node) { UNREACHABLE(); }
+
+
 void InstructionSelector::VisitFloat64RoundTruncate(Node* node) {
   X87OperandGenerator g(this);
   Emit(kX87Float64Round | MiscField::encode(kRoundToZero),