[turbofan] Assign appropriate types to some Date builtins.

src/compiler/js-builtin-reducer.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_JS_BUILTIN_REDUCER_H_
 #define V8_COMPILER_JS_BUILTIN_REDUCER_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
 
@@ skipping 24 matching lines @@
 
   JSBuiltinReducer(Editor* editor, JSGraph* jsgraph, Flags flags,
                    CompilationDependencies* dependencies);
   ~JSBuiltinReducer() final {}
 
   Reduction Reduce(Node* node) final;
 
  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);
   Reduction ReduceMathAsin(Node* node);
   Reduction ReduceMathAsinh(Node* node);
   Reduction ReduceMathAtan(Node* node);
   Reduction ReduceMathAtanh(Node* node);
   Reduction ReduceMathAtan2(Node* node);
   Reduction ReduceMathCbrt(Node* node);
   Reduction ReduceMathCeil(Node* node);
@@ skipping 46 matching lines @@
   TypeCache const& type_cache_;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSBuiltinReducer::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_BUILTIN_REDUCER_H_