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Some instructions do not ignore W=1 correctly in 32 bit mode

Created by: khuey

Consider two encodings of vcvtsi2ss

62 f1 d6 38 2a f0
62 f1 56 38 2a f0

Both are identical versions of vcvtsi2ss xmm6,xmm5,eax,{rd-sae} except for W=0/1. Per the Intel SDM "VEX.W1/EVEX.W1 in non-64 bit is ignored; the instructions behaves as if the W0 version is used." However DR fails to decode the W=1 version.