[turbofan] Turn Math.clz32 into an inlinable builtin.

src/compiler/ia32/instruction-codes-ia32.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_IA32_INSTRUCTION_CODES_IA32_H_
 #define V8_COMPILER_IA32_INSTRUCTION_CODES_IA32_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 12 matching lines @@
   V(IA32ImulHigh)                  \
   V(IA32UmulHigh)                  \
   V(IA32Idiv)                      \
   V(IA32Udiv)                      \
   V(IA32Not)                       \
   V(IA32Neg)                       \
   V(IA32Shl)                       \
   V(IA32Shr)                       \
   V(IA32Sar)                       \
   V(IA32Ror)                       \
+  V(IA32Lzcnt)                     \
   V(SSEFloat64Cmp)                 \
   V(SSEFloat64Add)                 \
   V(SSEFloat64Sub)                 \
   V(SSEFloat64Mul)                 \
   V(SSEFloat64Div)                 \
   V(SSEFloat64Mod)                 \
   V(SSEFloat64Max)                 \
   V(SSEFloat64Min)                 \
   V(SSEFloat64Sqrt)                \
   V(SSEFloat64Round)               \
@@ skipping 60 matching lines @@
   V(M2I)  /* [      %r2*2 + K] */      \
   V(M4I)  /* [      %r2*4 + K] */      \
   V(M8I)  /* [      %r2*8 + K] */      \
   V(MI)   /* [              K] */
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_IA32_INSTRUCTION_CODES_IA32_H_