[builtins] Refactor the remaining Date builtins.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 2bf85f87c2a04592828fbff1f3068582266ed442..f74b18297d5eb9f5ed14e505be2752d0d1020bad 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -12463,25 +12463,6 @@ void HOptimizedGraphBuilder::GenerateIsDate(CallRuntime* call) {
 }
 
 
-void HOptimizedGraphBuilder::GenerateThrowNotDateError(CallRuntime* call) {
-  DCHECK_EQ(0, call->arguments()->length());
-  Add<HDeoptimize>(Deoptimizer::kNotADateObject, Deoptimizer::EAGER);
-  Add<HSimulate>(call->id(), FIXED_SIMULATE);
-  return ast_context()->ReturnValue(graph()->GetConstantUndefined());
-}
-
-
-void HOptimizedGraphBuilder::GenerateDateField(CallRuntime* call) {
-  DCHECK(call->arguments()->length() == 2);
-  DCHECK_NOT_NULL(call->arguments()->at(1)->AsLiteral());
-  Smi* index = Smi::cast(*(call->arguments()->at(1)->AsLiteral()->value()));
-  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
-  HValue* date = Pop();
-  HDateField* result = New<HDateField>(date, index);
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateOneByteSeqStringSetChar(
     CallRuntime* call) {
   DCHECK(call->arguments()->length() == 3);