[builtins] Migrate Number.parseFloat to a TurboFan builtin.

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 1331 matching lines @@
                           Builtins::kNumberPrototypeToLocaleString, 0, false);
 
     // Install the Number functions.
     SimpleInstallFunction(number_fun, "isFinite", Builtins::kNumberIsFinite, 1,
                           true);
     SimpleInstallFunction(number_fun, "isInteger", Builtins::kNumberIsInteger,
                           1, true);
     SimpleInstallFunction(number_fun, "isNaN", Builtins::kNumberIsNaN, 1, true);
     SimpleInstallFunction(number_fun, "isSafeInteger",
                           Builtins::kNumberIsSafeInteger, 1, true);
+
+    // Install Number.parseFloat and Global.parseFloat.
+    Handle<JSFunction> parse_float_fun = SimpleInstallFunction(
+        number_fun, "parseFloat", Builtins::kNumberParseFloat, 1, true);
+    JSObject::AddProperty(global_object,
+                          factory->NewStringFromAsciiChecked("parseFloat"),
+                          parse_float_fun, DONT_ENUM);
   }
 
   {  // --- B o o l e a n ---
     Handle<JSFunction> boolean_fun =
         InstallFunction(global, "Boolean", JS_VALUE_TYPE, JSValue::kSize,
                         isolate->initial_object_prototype(),
                         Builtins::kBooleanConstructor);
     boolean_fun->shared()->DontAdaptArguments();
     boolean_fun->shared()->SetConstructStub(
         *isolate->builtins()->BooleanConstructor_ConstructStub());
@@ skipping 2963 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8