Implement date library functions in C++.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 45a0508dfdeefeac7aec3d0c19c99948b8ed2bb4..f2e1cfe3c972f0d0d635bb1b499b03f6de7806a1 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1601,6 +1601,13 @@ LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
+  LOperand* object = UseFixed(instr->value(), rax);
+  LDateField* result = new LDateField(object, instr->index());
+  return MarkAsCall(DefineFixed(result, rax), instr);
+}
+
+
 LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
   LOperand* value = UseRegisterOrConstantAtStart(instr->index());
   LOperand* length = Use(instr->length());