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

src/compiler/js-intrinsic-lowering.h

Index: src/compiler/js-intrinsic-lowering.h
diff --git a/src/compiler/js-intrinsic-lowering.h b/src/compiler/js-intrinsic-lowering.h
index 21982ac701329a5f57271dbcd56a379ad33efc58..6bc0c7d26f16d57bce6e471b20c3232b0fb58cb7 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -35,6 +35,7 @@ class JSIntrinsicLowering FINAL : public Reducer {
   Reduction ReduceInlineConstructDouble(Node* node);
   Reduction ReduceInlineDoubleLo(Node* node);
   Reduction ReduceInlineDoubleHi(Node* node);
+  Reduction ReduceInlineMathClz32(Node* node);
   Reduction ReduceInlineMathFloor(Node* node);
   Reduction ReduceInlineMathSqrt(Node* node);
   Reduction ReduceInlineStringGetLength(Node* node);