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

src/compiler/ppc/instruction-selector-ppc.cc

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index 1c0e4663add7b8f449f551046f2f164220c97329..8d8fbdaf19dd582e24d1e11d272c8ed7a06051cf 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -737,6 +737,12 @@ void InstructionSelector::VisitWord64Ror(Node* node) {
 #endif
 
 
+void InstructionSelector::VisitWord32Clz(Node* node) {
+  PPCOperandGenerator g(this);
+  Emit(kPPC_Cntlz32, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitInt32Add(Node* node) {
   VisitBinop<Int32BinopMatcher>(this, node, kPPC_Add32, kInt16Imm);
 }