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

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1500 matching lines @@
     case Runtime::kInlineIsFunction:
     case Runtime::kInlineIsRegExp:
       return Bounds(Type::None(zone()), Type::Boolean(zone()));
     case Runtime::kInlineDoubleLo:
     case Runtime::kInlineDoubleHi:
       return Bounds(Type::None(zone()), Type::Signed32());
     case Runtime::kInlineConstructDouble:
     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;
   }
   return Bounds::Unbounded(zone());
 }
 
 
 Bounds Typer::Visitor::TypeJSDebugger(Node* node) {
   UNREACHABLE();
   return Bounds();
@@ skipping 281 matching lines @@
 Bounds Typer::Visitor::TypeWord32Ror(Node* node) {
   return Bounds(Type::Integral32());
 }
 
 
 Bounds Typer::Visitor::TypeWord32Equal(Node* node) {
   return Bounds(Type::Boolean());
 }
 
 
+Bounds Typer::Visitor::TypeWord32Clz(Node* node) {
+  return Bounds(Type::Integral32());
+}
+
+
 Bounds Typer::Visitor::TypeWord64And(Node* node) {
   return Bounds(Type::Internal());
 }
 
 
 Bounds Typer::Visitor::TypeWord64Or(Node* node) {
   return Bounds(Type::Internal());
 }
 
 
@@ skipping 391 matching lines @@
       TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE
     }
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8