[turbofan] Assign appropriate types to some Date builtins.

src/compiler/js-builtin-reducer.h

Index: src/compiler/js-builtin-reducer.h
diff --git a/src/compiler/js-builtin-reducer.h b/src/compiler/js-builtin-reducer.h
index fc25bb6cb43eae4e422d953589c8d84e61a6da0a..3fa2707c0cd1b39a8543ec04be741fabbac859d8 100644
--- a/src/compiler/js-builtin-reducer.h
+++ b/src/compiler/js-builtin-reducer.h
@@ -42,6 +42,7 @@ class JSBuiltinReducer final : public AdvancedReducer {
  private:
   Reduction ReduceArrayPop(Node* node);
   Reduction ReduceArrayPush(Node* node);
+  Reduction ReduceDateGetTime(Node* node);
   Reduction ReduceMathAbs(Node* node);
   Reduction ReduceMathAcos(Node* node);
   Reduction ReduceMathAcosh(Node* node);