[WINED3D] Support for shift modifiers (resend)

[Ivan Gyurdiev]

I was advised to resubmit. Here is the shift modifier patch from before. 
No changes were made, it should apply, with offset warnings.

It adds support for _x2, _x4, _x8, _d2, _d4, _d8 modifiers to pixel 
shaders, which was incorrectly commented out.
It also prints out destination register modifiers in the TRACE message.


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