[builtins] Migrate Math.abs() to TurboFan builtins.

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 1651 matching lines @@
 
   {  // -- M a t h
     Handle<String> name = factory->InternalizeUtf8String("Math");
     Handle<JSFunction> cons = factory->NewFunction(name);
     JSFunction::SetInstancePrototype(
         cons,
         Handle<Object>(native_context()->initial_object_prototype(), isolate));
     Handle<JSObject> math = factory->NewJSObject(cons, TENURED);
     DCHECK(math->IsJSObject());
     JSObject::AddProperty(global, name, math, DONT_ENUM);
+    Handle<JSFunction> math_abs =
+        SimpleInstallFunction(math, "abs", Builtins::kMathAbs, 1, true);
+    native_context()->set_math_abs(*math_abs);
     SimpleInstallFunction(math, "acos", Builtins::kMathAcos, 1, true);
     SimpleInstallFunction(math, "asin", Builtins::kMathAsin, 1, true);
     SimpleInstallFunction(math, "atan", Builtins::kMathAtan, 1, true);
     SimpleInstallFunction(math, "atan2", Builtins::kMathAtan2, 2, true);
     SimpleInstallFunction(math, "atanh", Builtins::kMathAtanh, 1, true);
     SimpleInstallFunction(math, "ceil", Builtins::kMathCeil, 1, true);
     SimpleInstallFunction(math, "cbrt", Builtins::kMathCbrt, 1, true);
     SimpleInstallFunction(math, "expm1", Builtins::kMathExpm1, 1, true);
     SimpleInstallFunction(math, "clz32", Builtins::kMathClz32, 1, true);
     SimpleInstallFunction(math, "cos", Builtins::kMathCos, 1, true);
@@ skipping 2262 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8