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

src/compiler/machine-operator.h

 // Copyright 2013 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_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
 #include "src/base/flags.h"
 #include "src/machine-type.h"
 
@@ skipping 332 matching lines @@
 // Pseudo operators that translate to 32/64-bit operators depending on the
 // word-size of the target machine assumed by this builder.
 #define PSEUDO_OP_LIST(V) \
   V(Word, And)            \
   V(Word, Or)             \
   V(Word, Xor)            \
   V(Word, Shl)            \
   V(Word, Shr)            \
   V(Word, Sar)            \
   V(Word, Ror)            \
+  V(Word, Clz)            \
   V(Word, Equal)          \
   V(Int, Add)             \
   V(Int, Sub)             \
   V(Int, Mul)             \
   V(Int, Div)             \
   V(Int, Mod)             \
   V(Int, LessThan)        \
   V(Int, LessThanOrEqual) \
   V(Uint, Div)            \
   V(Uint, LessThan)       \
@@ skipping 15 matching lines @@
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_