[builtins] Provide Math.floor as TurboFan builtin.

src/crankshaft/hydrogen.h

 // Copyright 2012 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_CRANKSHAFT_HYDROGEN_H_
 #define V8_CRANKSHAFT_HYDROGEN_H_
 
 #include "src/accessors.h"
 #include "src/allocation.h"
 #include "src/ast/ast.h"
@@ skipping 2251 matching lines @@
   F(ArrayBufferViewGetByteLength)      \
   F(ArrayBufferViewGetByteOffset)      \
   F(TypedArrayGetLength)               \
   /* ArrayBuffer */                    \
   F(ArrayBufferGetByteLength)          \
   /* Maths */                          \
   F(ConstructDouble)                   \
   F(DoubleHi)                          \
   F(DoubleLo)                          \
   F(MathClz32)                         \
-  F(MathFloor)                         \
   F(MathLogRT)                         \
   /* ES6 Collections */                \
   F(MapClear)                          \
   F(MapInitialize)                     \
   F(SetClear)                          \
   F(SetInitialize)                     \
   F(FixedArrayGet)                     \
   F(FixedArraySet)                     \
   F(JSCollectionGetTable)              \
   F(StringGetRawHashField)             \
@@ skipping 803 matching lines @@
   }
 
  private:
   HOptimizedGraphBuilder* builder_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_