[builtins] Migrate Math.clz32 to a TurboFan builtin.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index adaec2830642c69334f7433ff477440ff6d629a1..2f784f7af8f045a97621ceeffe2f38b1fc7b9307 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1631,8 +1631,6 @@ Type* Typer::Visitor::TypeJSCallRuntime(Node* node) {
     case Runtime::kInlineConstructDouble:
     case Runtime::kInlineMathAtan2:
       return Type::Number();
-    case Runtime::kInlineMathClz32:
-      return Type::Range(0, 32, zone());
     case Runtime::kInlineCreateIterResultObject:
     case Runtime::kInlineRegExpConstructResult:
       return Type::OtherObject();
@@ -1759,6 +1757,10 @@ Type* Typer::Visitor::TypeNumberShiftRightLogical(Node* node) {
   return Type::Unsigned32();
 }
 
+Type* Typer::Visitor::TypeNumberClz32(Node* node) {
+  return typer_->cache_.kZeroToThirtyTwo;
+}
+
 Type* Typer::Visitor::TypeNumberCeil(Node* node) {
   return TypeUnaryOp(node, NumberCeil);
 }