UserspaceEmulator: Result is initialized after OR with all-1 immediate

When compiling with "-Os", GCC produces the following pattern for
atomic decrement (which is used by our RefCounted template):

    or eax, -1
    lock xadd [destination], eax

Since or-ing with -1 will always produce the same output (-1), we can
mark the result of these operations as initialized. This stops us from
complaining about false positives when running the shell in UE. :^)

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