dbghelp: Fix uninitialized variable usage.

[Thomas Faber]

Hi,

op2 is used without being read in these cases.
Because there is a default case which doesn't need the value, I'm not
putting the read above the switch (might break 48 C3 aka REX.W RET. Not
sure if that's valid, but it's allowed by the current code).

Spotted by 64-bit MSVC.
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