Fix memory leak. Make "V8 Linux - memcheck" build bot happy.

src/v8.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/assembler.h"
 #include "src/base/once.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 36 matching lines @@
 void V8::TearDown() {
   Bootstrapper::TearDownExtensions();
   ElementsAccessor::TearDown();
   LOperand::TearDownCaches();
   compiler::Pipeline::TearDown();
   ExternalReference::TearDownMathExpData();
   RegisteredExtension::UnregisterAll();
   Isolate::GlobalTearDown();
 
   Sampler::TearDown();
+  FlagList::ResetAllFlags();  // Frees memory held by string arguments.
 }
 
 
 void V8::SetReturnAddressLocationResolver(
       ReturnAddressLocationResolver resolver) {
   StackFrame::SetReturnAddressLocationResolver(resolver);
 }
 
 
 void V8::InitializeOncePerProcessImpl() {
@@ skipping 47 matching lines @@
   platform_ = NULL;
 }
 
 
 v8::Platform* V8::GetCurrentPlatform() {
   DCHECK(platform_);
   return platform_;
 }
 
 } }  // namespace v8::internal