Small, trivial change to resolve initialization order reordering in constructors, required for JDK-8288293

gcc will fail to compile a Windows JDK with the following errors, which causes a build failure eventually:
GDIHashtable.cpp: m_nCounter is initialized before m_nDestroyPeriod [-Werror=reorder] for libawt
sawindbg.cpp: bytePtr is initialized before releaseMode [-Werror=reorder] for libsaproc

Moving the initializer list to the correct order to resolve this build failure is trivial, and is done so in this change