Avoid using inline assmbly

[Necrolis]

You can use _InterlockedCompareExchange64 to get rid of the inline assembly, plus if you want to be pedantic about safe patching, you should call FlushInstructionCache as well.

[MalwareTech]

Thank you, I've added FlushInstructionCache and an option to choose between _InterlockedCompareExchange64 and inline ASM.