[builtins] Provide Math.floor as TurboFan builtin.

test/unittests/compiler/js-intrinsic-lowering-unittest.cc

Index: test/unittests/compiler/js-intrinsic-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
index b4528b721e92b96151d7e289aedea4e830c94f0a..af10adf6665990d3b254ccf65d9ae966504c021f 100644
--- a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
+++ b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
@@ -242,24 +242,6 @@ TEST_F(JSIntrinsicLoweringTest, InlineIsJSReceiver) {
 
 
 // -----------------------------------------------------------------------------
-// %_MathFloor
-
-
-TEST_F(JSIntrinsicLoweringTest, InlineMathFloor) {
-  Node* const input = Parameter(0);
-  Node* const context = Parameter(1);
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-  Reduction const r = Reduce(
-      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineMathFloor, 1),
-                       input, context, effect, control),
-      MachineOperatorBuilder::kFloat64RoundDown);
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsFloat64RoundDown(input));
-}
-
-
-// -----------------------------------------------------------------------------
 // %_MathClz32
 
 TEST_F(JSIntrinsicLoweringTest, InlineMathClz32) {