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

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 67e2c55b29aa59c5d4c873f8af238e588753e41d..e044450b37f988f1c9f127aae2e4e5ca29009e96 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1518,6 +1518,8 @@ Bounds Typer::Visitor::TypeJSCallRuntime(Node* node) {
     case Runtime::kInlineMathFloor:
     case Runtime::kInlineMathSqrt:
       return Bounds(Type::None(zone()), Type::Number());
+    case Runtime::kInlineMathClz32:
+      return Bounds(Type::None(), Type::Range(0, 32, zone()));
     default:
       break;
   }
@@ -1819,6 +1821,11 @@ Bounds Typer::Visitor::TypeWord32Equal(Node* node) {
 }
 
 
+Bounds Typer::Visitor::TypeWord32Clz(Node* node) {
+  return Bounds(Type::Integral32());
+}
+
+
 Bounds Typer::Visitor::TypeWord64And(Node* node) {
   return Bounds(Type::Internal());
 }