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

src/compiler/arm64/instruction-selector-arm64.cc

Index: src/compiler/arm64/instruction-selector-arm64.cc
diff --git a/src/compiler/arm64/instruction-selector-arm64.cc b/src/compiler/arm64/instruction-selector-arm64.cc
index edef43837b3fe264c646b7da37fe99b61e04904e..97099e2253702cc91aacf0335c6015b355eb99b8 100644
--- a/src/compiler/arm64/instruction-selector-arm64.cc
+++ b/src/compiler/arm64/instruction-selector-arm64.cc
@@ -738,6 +738,12 @@ void InstructionSelector::VisitWord64Ror(Node* node) {
 }
 
 
+void InstructionSelector::VisitWord32Clz(Node* node) {
+  Arm64OperandGenerator g(this);
+  Emit(kArm64Clz32, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitInt32Add(Node* node) {
   Arm64OperandGenerator g(this);
   Int32BinopMatcher m(node);