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

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

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index 92562f0e64963636b4260002bf41e8f8ad37ded5..b843ad698536d045bc8ce1a0345864d78464f50d 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -839,6 +839,10 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     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;