[builtins] Migrate Math.clz32 to a TurboFan builtin.

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

 // Copyright 2015 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.
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/diamond.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-intrinsic-lowering.h"
 #include "src/compiler/js-operator.h"
 #include "test/unittests/compiler/graph-unittest.h"
@@ skipping 224 matching lines @@
   Node* const control = graph()->start();
   Reduction const r = Reduce(graph()->NewNode(
       javascript()->CallRuntime(Runtime::kInlineIsJSReceiver, 1), input,
       context, effect, control));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(r.replacement(), IsObjectIsReceiver(input));
 }
 
 
 // -----------------------------------------------------------------------------
-// %_MathClz32
-
-TEST_F(JSIntrinsicLoweringTest, InlineMathClz32) {
-  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::kInlineMathClz32, 1),
-                       input, context, effect, control));
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsWord32Clz(input));
-}
-
-
-// -----------------------------------------------------------------------------
 // %_ValueOf
 
 
 TEST_F(JSIntrinsicLoweringTest, InlineValueOf) {
   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::kInlineValueOf, 1),
@@ skipping 42 matching lines @@
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(
       r.replacement(),
       IsLoadContext(
           ContextAccess(0, Context::ORDINARY_HAS_INSTANCE_INDEX, true), _));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8