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

src/compiler/ppc/code-generator-ppc.cc

 // 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.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/ppc/macro-assembler-ppc.h"
@@ skipping 821 matching lines @@
       break;
     case kPPC_TruncateFloat64:
       ASSEMBLE_FLOAT_UNOP_RC(friz);
       break;
     case kPPC_RoundFloat64:
       ASSEMBLE_FLOAT_UNOP_RC(frin);
       break;
     case kPPC_NegFloat64:
       ASSEMBLE_FLOAT_UNOP_RC(fneg);
       break;
+    case kPPC_Cntlz32:
+      __ cntlzw_(i.OutputRegister(), i.InputRegister(0));
+      DCHECK_EQ(LeaveRC, i.OutputRCBit());
+      break;
     case kPPC_Cmp32:
       ASSEMBLE_COMPARE(cmpw, cmplw);
       break;
 #if V8_TARGET_ARCH_PPC64
     case kPPC_Cmp64:
       ASSEMBLE_COMPARE(cmp, cmpl);
       break;
 #endif
     case kPPC_CmpFloat64:
       ASSEMBLE_FLOAT_COMPARE(fcmpu);
@@ skipping 594 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8