Merge "Create an empty String8 to cause the first allocation" am: 896cdca9...

#include <functional>

#include <vector>

static android::String8 gEmpty(""); // make sure first allocation from optimization runs

struct DestructionAction {

    DestructionAction(std::function<void()> f) : mF(std::move(f)) {}

    ~DestructionAction() { mF(); };