[date] Refactor the %_DateField intrinsic to be optimizable.

src/compiler/linkage.cc

Index: src/compiler/linkage.cc
diff --git a/src/compiler/linkage.cc b/src/compiler/linkage.cc
index 24f5e490a7391fa8f6e568dd69706dfc221bb431..3349c52cc3b6422db6972b8b375373191f8ae220 100644
--- a/src/compiler/linkage.cc
+++ b/src/compiler/linkage.cc
@@ -132,10 +132,11 @@ bool Linkage::NeedsFrameState(Runtime::FunctionId function) {
       return false;
     case Runtime::kInlineArguments:
     case Runtime::kInlineCallFunction:
-    case Runtime::kInlineDateField:
+    case Runtime::kInlineDateField:  // TODO(bmeurer): Remove this.
     case Runtime::kInlineDeoptimizeNow:
     case Runtime::kInlineGetPrototype:
     case Runtime::kInlineRegExpExec:
+    case Runtime::kInlineThrowIfNotADate:
       return true;
     default:
       break;